Each header is cutsom fit to the specific engine and includes applicable screws,
flexible connector* and tie straps. Unless otherwise excluded





/.10 size are 7/32" less/ - /.20 size are 1/16" less/
/.90-3.2 are 1/16" more/ - /3.0-up are 1/8" more/


inch to mm -/- Std. 1 5/8"= 41.27mm
Long 2 3/8"= 60.325mm ex-long 3 1/8`"= 79.375mm


Marine Headers are the same as standard Headers,
but angling up out of a boat at 15 / 'degrees' or use on a
high wing airplane to angle down under the wing at 15 / 'degrees'

Engine(s) Fitted Stock #
standard long ex-long 15 marine
.10-.15 Engines ( 9/16"od Alum. tubing / uses - 1/2"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
O.S. .10-.18 CV,FP,LA&FSR
K&B .18 (bolt through)
Magnum XLS.15
MDS .18 FS Pro
Thunder Tiger GP .10-.15
(screws 4/40 x 1 1/4" fillister head)
(center to center = 27.43mm/1.080")
Super Tiger.18 Inboard Engine
(the mounting of this motor hasn't been
verified - any help would be appreciated)
2040 2041 2042 2043
.20-.36 Engines ( 5/8"od Alum. tubing / uses - 1/2"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
HP .20 (bolt-on)
(screws 3mm x 12mm socket head)
(center to center = 27.94mm/1.100")
2250 2251 2252 2253
MVVS .20 (bolt-on)
(screws 2.5mm x 12mm socket head)
(center to center = 24.94mm/.982")
2260 2261 2262 2263
Irvine .20 (bolt-on)
(screws 4/40 x 1/2" socket head)
(center to center = 25.40mm/1.000")
2270 2271 2272 2273
O.S. .20-.25 FP & LA
Magnum .21-.28 GP
Thunder Tiger GP .25
Super Tiger G .34 (bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 32.11mm/1.264")
2300 2301 2302 2303
O.P.S. 3.5 (.21)
Norvel .25 BB (bolt-on)
(screws 5/40 x 1/2" socket head)
(center to center = 26.97mm/1.062")
2310 2311 2312 2313
O.S. .21-.36 FS-SF-FX-SX-AX
(for OS.20-.25 FP or LA see #2300)
Enya .21CX, SS30, 35X-TN & 35XS
Evolution .36 NT
GMS 2000 ABC .25-.36
Jett .25-.35
Kyosho .32-.36 GT
Magnum XLS.25 & .25-.28 Pro
MDS .28-38 FS Pro
NovaRossi Rex R.28 CR
Thunder Tiger Pro .25-.36
Webra .25-.36 Speed (bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 35.05mm/1.380")
2340 2341 2342 2343
Super Tiger S .21-.34K (bolt-on) 2360 2361 2362 2363
.35-.55 Engines ( 3/4"od Alum. tubing / uses - 5/8"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
Enya .40-.45 X & CX (bolt-on)
O.P.S. .40
(screws 3.5mm x 12mm socket head)
(center to center = 29.97mm/1.180")
2420 2421 2422 2423
Enya .40 SS(bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 42.16mm/1.660")
(can be used on a .40-.45 CX)
(that has the bolt-through holes)
2430 2431 2432 2433
Enya 40XZ-TN & 40XZS (see-#2650) - - - -
Jett .40-.50 (not the 40L)
H.B. .40 (bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 38.10mm/1.500")
2490 2491 2492 2493
K&B.40 (bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 31.75mm/1.250")
2530 2531 2532 2533
K&B.45 Sportster &.48(bolt through)
(screws 6/32 x 1 1/2" socket head)
(center to center = 35.15mm/1.384")
2540 2541 2542 2543
MVVS .40 (bolt-on)
(screws 3mm x 12mm socket head)
(center to center = 28.60mm/1.126")
2550 2551 2552 2553
Norvel AX .40 (see-#2800) - - - -
O.S. .40-.45 FSR (bolt-on)
ASP .40
Fox .45, & .50 BBRC
Irvine .40 (bolt on)
(screws 3.5mm x 12mm socket head)
(center to center = 27.94mm/1.100")
HP .40 (bolt-on)
(screws 3mm x 12mm socket head)
2580 2581 2582 2583
O.S..40-.46 FX,SF (bolt through)
O.S..46-.55 AX, .50 SX
ASP.46
Evolution.40-.46 NT&.46NX,.52NX,
.60NX & TrainerA & 10cc GX (gas)
MACS Product Requires this
header be segmented and the pipe
be double mounted when used on
the Evo.10cc GX (gas) motor or any
gas motors.
GMS 2000 ABS .40 & .47
Magnum XLS .46-.52
MDS .40-.48 FS Pro
Mecoa .40-.46
NovaRossi Rex R.46/.57 CR
Rossi .45-.53 (new-bolt through)
Royal .46
Tower .46 (bolt through)
Thunder Tiger Pro .40-.46
Y.S. .56 SR (bolt through)
(screws 5/40 x 1 1/2" socket head)
(center to center = 37.08mm/1.460")
2590 2591 2592 2593
Rossi .40,.45&.53 (bolt-on)
Powerhouse .40-.45
(Won't fit the new Bolt-Through motors)
(screws 3.5mm x 12mm socket head)
(center to center = 31.75mm/1.250")
2600 2601 2602 2603
Picco .40 (bolt-on)
(screws 3mm x 12mm socket head)
(center to center = 27.69mm/1.090")
2610 2611 2612 2613
Super Tiger GS .40-.45-.51
Como .40-.51 (bolt through)
(screws 6/32 x 1 1/2" fillister head)
(center to center = 38.61mm/1.520")
2620 2621 2622 2623
Super Tiger S .40-.45 (K)
Como .40-.45 (bolt-on)
(screws 3.5mm x 12mm socket head)
(center to center = 38.61mm/1.520")
2630 2631 2632 2633
Webra.40-.55 Speed(bolt through)
(screws 4/40 x 1 1/2" fillister head)
(center to center = 39.12mm/1.540")
2640 2641 2642 2643
O.S. .40-.46 FP & LA (bolt through)
Enya 40XZ-TN & 40XZS
Evolution .40NX
Jett .40L
Magnum .40-.44GP
ThunderTiger GP .42 & .46
Webra .40 RC (non-Speed)
(screws 4/40 x 1 1/4" fillister head)
(center to center = 35.05mm/1.380")
2650 2651 2652 2653
Webra .40-.50 Speed (old strap)
(This motors has no exhaust mounting
system - the header press-fits over
the exhaust and straps in place)
2660 2661 2662 2663
YS .45 SF (bolt-on)
(screws 3.5mm x 12mm socket head)
(center to center = 31.19mm/1.228")
(The new YS.56 SR is a bolt-through)
(motor - use a #2590-2593 )
2670 2671 2672 2673
.50-.75 Engines ( 3/4"od Alum. tubing / uses - 5/8"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
Enya.45-.50SS & .50CX
&.61CX TN & CXS PRO (bolt through)
(screws 5/40 x 1 1/2" socket head)
(center to center = 42.16mm/1.660")
2710 2711 2712 2713
H.P. .61
Webra .61 Speed (old strap-on)
(countersink 1.658"lx.433"hx.062"d)
2730 2731 2732 2733
Fox .60 Eagle III (bolt-on)
Irvine .61
(screws 6/32 x 1/2" socket head)
(center to center = 34.80mm/1.370")
2750 2751 2752 2753
K & B .61 , H.B. .61
Jett .60 L(not the .65, .67L or .76L)
Webra .61 BH (bolt through)
(screws 5/40 x 1 1/2" socket head-n/w)
(center to center = 38.10mm/1.500")
2770 2771 2772 2773
K & B .65 Sportster (bolt through)
(screws 6/32 x 1 1/2" socket head)
(center to center = 38.10mm/1.500")
2780 2781 2782 2783
Kraft .61 (bolt-on)
RJLK .61
Y.S. .61 long
(Norvel AX .40)
(screws 3.5mm x 12mm socket head)
(center to center = 32.21mm/1.268")
2800 2801 2802 2803
Moki .60 (bolt-on)
(screws 4mm x 12mm socket head)
(center to center = 28.24mm/1.112")
(Moki.61 M7 see #2850-3)
2810 2811 2812 2813
MDS .58 FS Pro (bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 42.06mm/1.656")
2820 2821 2822 2823
O.S. .50 FSR & .61 FSR (bolt-on)
ASP .61
Enya 60X
MVVS .61-.77
Webra Speed .61-.70 F (bolt-on)
(screws 4mm x 12mm socket head)
(center to center = 33.91mm/1.335")
(Moki.61 M7 looks like it will fit,
being tested waiting for results)
2850 2851 2852 2853
O.S. .61 FX & SF, .65 & .75 AX
O.S. .60 FP & LA, .65 LA (bolt through)
Evolution .61NT & .61NX
(will not fit the .60NX or
10cc (gas) see #2590)
GMS 2000 ABC .61 (not the .76
or the .61 ringed, the new ringed .61
is a bolt-on not a bolt-through
see #2890 - #2893)
Jett .67L & .76L (not the .60L or .65)
Magnum XLS.61 & .61 Pro
MDS .68-.78 FS Pro
NovaRossi Rex R.60 CR
Rossi .60-.65 (new)
ThunderTiger GP & Pro .61
Webra .61-.75 P5-H (bolt through)
(screws 8/32 x 1 3/4" fillister head)
(center to center = 42.06mm/1.656")
2860 2861 2862 2863
Rossi .61 & .61
Powerhouse .60 (bolt-on)
(screws 4mm x 12mm socket head)
(center to center = 36.12mm/1.422")
(Won't fit the newer Bolt-Through motors)
(Some of the older 3.5mm screw
versions are still available.) Call
2870 2871 2872 2873
Picco .60 (bolt-on)
(screws 3mm x 12mm socket head)
(center to center = 27.69mm/1.090")
2880 2881 2882 n/a
Tower .61 & .75 (bolt-on)
GMS 2000 .61 ringed
GMS 2000 .76A
(screws 4mm x 12mm socket head)
(center to center = 40.13mm/1.580")
2890 2891 2892 2893
Super Tiger G .60, S .61-.75
Jett .65 (not the .60L, .67L or .76L)
Como .61-.75 (bolt through)
(screws 6/32 x 1 1/4" fillister head-n/w)
(center to center = 47.12mm/1.855")
2900 2901 2902 2903
Super Tiger S .61 K, .75 K (bolt-on)
(screws 3.5mm x 12mm socket head)
(center to center = 47.12mm/1.855")
2920 2921 2922 2923
Y.S. .60 (non long-stroke) (bolt-on)
(screws 4mm x 12mm socket head)
(center to center = 32.21mm/1.268")
2930 2931 2932 2933
for tuned pipes for airplanes see Aero-Tuned Pipes
for tuned pipes for boats & helicopters see Marine & Helo-Tuned Pipes
Also see Special Application Headers




Engine(s) Fitted Stock #
standard long ex-long 15 marine
.90-1.20 Engines ( 7/8"od Alum. tubing / uses - 3/4"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
O.S. .90-1.08 FSR (old three bolt)
(screws upper two 4mm x 12mm socket)
(head-center to center=33.91mm/1.335")
(lower one 3.5mm x 12mm socket head)
2940 2941 2942 2943
MVVS .91 - 1.08
ASP .90-1.08
Magnum .90-1.08 (bolt-on)
(screws 4mm x 16mm socket head)
(center to center = 33.91mm/1.335")
2960 2961 2962 n/a
Rossi .91 (bolt-on)
(screws 3.5mm x 12mm socket head)
(center to center = 40.13mm/1.580")
(Won't fit the newer Bolt-Through motors)
2965 2966 2967 n/a
Super Tiger G 90
Jett .90-1.20 (bolt through)
(screws 6/32 x 1 1/4" fillister head)
(center to center = 47.12mm/1.855")
2970 2971 2972 2973
Super Tiger K 91 (bolt-on)
(screws 3.5mm x 12mm socket head)
(center to center = 47.14mm/1.856")
2975 2976 2977 n/a
O.S. 91 FX, SX& SZ .95 AX, GT 15
ASP .91 (bolt through)
Evolution.91 NX, 15cc GX(gas)
MACS Product Requires this
header be segmented and the pipe
be double mounted when used on
the Evo.15cc GX (gas), GT 15
motors or any gas motor.
Magnum .91 Pro
NovaRossi Rex R.91 CR, ICARUS 91 S
Webra .91 P5 & i (bolt through)
(screws 8/32 x 1 3/4" fillister head)
(center to center = 42.06mm/1.656")
2980 2981 2982 2983
Y.S. .90 &.91 SR, .91 ST (bolt-on)
(screws 4mm x 16mm socket head)
(center to center = 32.21mm/1.268")
2985 2986 2987 n/a
O.S. 120 AX (bolt through)
(screws 8/32 x 1 3/4" fillister head)
(center to center = 48.01mm/1.890")
2990 2991 2992 2993
1.2-1.5 Engines ( 7/8"od Alum. tubing / uses - 3/4"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
Irvine 120-150
(screws 4mm x 16mm socket head)
(center to center = 44.70mm/1.760")
4050 4051 4052 n/a
ASP 120
Evolution 100 NT & 1.20 NX
Magnum XL 120
(screws 4mm x 16mm socket head)
(center to center = 43.37mm/1.668")
4070 4071 4072 n/a
Super Tiger G 2300 (bolt through)
(screws 8/32 x 2" fillister head)
(center to center = 50.04mm/1.970")
4090 4091 4092 n/a
Thunder Tiger 120 Pro (bolt through)
(screws 8/32 x 2" fillister head)
(center to center = 48.77mm/1.920")
4100 4101 4102 n/a
Webra 120 / Bully 1.2 PR
GMS 2000 120 / Mark 135
MDS 148 / MVVS 215
UAV 120
(screws 4mm x 12mm socket head)
(center to center = 40.39mm/1.590")
4130 4131 4132 n/a
Zenoah G-20,G-23,G-26
(screws 5mm x 16mm socket head)
(center to center = 34.29mm/1.350")
4150 4151 4152 4153
Homelite 25cc
(screws 10/24 x 5/8" socket head)
(center to center = 38.35mm/1.510")
4180 4181 4182 4183
1.5-3.2 Engines ( 7/8"od Alum. tubing / uses - 3/4"id Silicone tubing)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
D.L.E. 20 (in design-sub#2985-2987)
OS 22 GT (The #2985-2987 will fit and
work, But the exhaust port is larger)
(screws 4mm x 12mm socket head)
(center to center = 32.21mm/1.268")
4200 4201 4202 n/a
D.L.E. 30
O.S. 33 GT
(screws 5mm x 16mm socket head)
(center to center = 33.98mm/1.338")
4210 4211 4212 n/a
Evolution 26cc
MVVS 1.6
(screws 4mm x 12mm socket head)
(center to center = 35.94mm/1.415")
4220 4221 4222 n/a
Moki 1.5-1.8-2.1
Mark 1.5-1.8-2.1
(screws 4mm x 12mm socket head)
(center to center = 34.08mm/1.342")
4230 4231 4232 n/a
Sachs Dolmar 2.0
Brison 2.4
(screws 5mm x 16mm socket head)
(cntr-cntr=26.60x20.37mm/1.026x.802")
4270 4271 4272 n/a
Sachs Dolmar 2.6-3.2 ci
Brison 3.2
(screws 5mm x 16mm socket head)
(center to center = 35.31mm/1.390")
4280 4281 4282 n/a
Super Tiger S 2000,2500,3000,3250
(screws 4mm x 12mm socket head)
(center to center = 44.25mm/1.742")
4300 4301 4302 n/a
O.S. 3500, 160
Super Tiger S 4500
(screws 5mm x 16mm socket head)
(center to center = 44.00mm/1.732")
4310 4311 4312 n/a
3W 35cc & 70-80cc Twin (3W41i,
3W50i, 3W85i, 3W100i, 3W40,
(screws 5mm x 16mm socket head)
(center to center = 36.32mm/1.430")
3W 70B2-These are unverified )
4360 4361 4362 n/a
ZDZ 40 (2.4)
(screws 5mm x 16mm socket head)
(center to center = 37.18mm/1.464")
4380 4381 4382 n/a
Zenoah 445 Twin, GT-80 & G74
(screws 5mm x 16mm socket head)
(center to center = 38.35mm/1.510")
4400 4401 4402 n/a
Zenoah G-45
(screws 10x32 socket head+square nut)
(center to center = 42.42mm/1.670")
4420 4421 4422 n/a
3.0-4.8 Engines ( 1"o.d. Alum. tubing )
(*flex connector not included - see our NEW "Ultra-Pure Silicone Tubing")
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
Quadra 52cc
(screws 5mm x 16mm socket head)
(center to center = 38.35mm/1.510")
4460 4461 4462 N/A
Sachs Dolmar 3.7 - 4.2
Brison 4.2 - Fox 150
(screws 6mm x 16mm socket head)
(center to center = 37.90mm/1.492")
4480 4481 4482 N/A
3W 35cc & 70-80cc Twin
(screws 5mm x 16mm socket head)
(center to center = 36.32mm/1.430")
(3W41i, 3W50i, 3W85i, 3W100i, 3W40,
3W 70B2-These are unverified )
4510 4511 4512 n/a
DL 50, DLE 50
O.S. 55 GT
3W 60cc & 120cc Twin
B.D. 5.1 Twin, ZDZ 50
(screws 5mm x 16mm socket head)
(center to center = 40.00mm/1.574")
4520 4521 4522 N/A
Webra 4.4 Bulli
Celti Husky 4.2
A/3 (A*A*A) 4.4 - 8.8
JPX 8.4 - 8.8
(screws 6mm x 16mm socket head)
(center to center = 40.28mm/1.586")
(for the Mahle case)
4540 4541 4542 N/A
Zenoah Q G-62
(screws 10x32 socket head+square nut)
(center to center = 42.42mm/1.670")
4560 4561 4562 N/A
4.5-up Engines ( 1" to 1 1/4"o.d. Alum. tubing )(We only use Aluminum
tubing NO STEEL - we prefer our header to break, NOT YOUR MOTOR)
(*flex connector not included)
(+PLEASE Note! MACS headers are not designed to support the tuned pipe
or in-line muffler that they connect to the motor they are attached to.)
DA 85s & 170twn (1" od tubing)
(screws 5mm x 16mm socket head)
(center to center = 41.88mm/1.648")
4590 4591 4592 N/A
DA 85s & 170twn (1 1/8" od tubing)
(screws 5mm x 16mm socket head)
(center to center = 41.88mm/1.648")
4595 4596 4597 N/A
Husky 6.0
Celty Husky 5.8
(screws 6mm x 16mm socket head)
(center to center = 46.23mm/1.820")
4620 4621 4622 N/A
Sachs Dolmar 5.8 (1" od tubing)
Fox 200
(screws 6mm x 16mm socket head)
(cntr-cntr=40.28x5.64mm/1.586x.222")
4660 4661 4662 call-!
Sachs Dolmar 5.8 (1 1/8" od tubing)
Fox 200
(screws 6mm x 16mm socket head)
(cntr-cntr=40.28x5.64mm/1.586x.222")
4665 4666 4667 call-!
BME 58/116 Xtreme (1" od tubing)
BME 50 Classic
(screws 5mm x 16mm socket head)
(cntr-cntr=24.73x19.10mm/.974x.752")
4670 4671 4672 N/A
BME 58/116 Xtreme (1 1/8" od tubing)
BME 50 Classic
(screws 5mm x 16mm socket head)
(cntr-cntr=24.73x19.10mm/.974x.752")
4675 4676 4677 N/A
+ - Please note MACS headers are not designed to support the Tuned Pipes
or In-Line muffler that are connected to them.
They (the Tuned Pipe or In-Line Muffler) must be self- supported.
MACS Products will not replace or repair headers used in this manner.
! - This header is available in an Extra-Extra-Long - for info. contact us.
for tuned pipes for airplanes see Aero-Tuned Pipes
for tuned pipes for boats & helicopters see Marine Tuned Pipes