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




Rear Exhaust Headers

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.)

Fits Engines Stock #
.15-.20 Engines ( 9/16"od Alum. tubing / uses - 1/2"id Silicone tubing)
  15º 1"
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K & B 3.5, O.S. .25 VF-DF
(screws 4/40x1/2"sochead for the K&B)
(screws 3mmx12mm sochead for the OS)
(center to center = 24.23mm/.954")
3350 3351 3352
MVVS .20R
(screws 2.5mm x 12mm socket head)
(center to center = 24.94mm/.982")
3370 3371 3372
.40-.46 Engines ( 3/4"od Alum. tubing / uses - 5/8"id Silicone tubing)
 
15°

1.2"
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Enya .45 CXL-R
(screws 3.5mm x 12mm socket head)
(center to center = 26.1mm?/1.028"?) n/a n/a n/a
K & B 6.5-7.5, Irvine .40 RE
(screws 6/32 x 1/2" socket head)
(center to center = 26.92mm/1.060")
3450 3451 3452
MVVS .40R
(screws 4/40 x 1/2" socket head)
(center to center = 28.75mm/1.132")
3470 3471 3472
O.P.S. .40
(screws 5/40 x 1/2" socket head)
(center to center = 27.58mm/1.086")
3480 3481 3482
O.S. .40-.46 VF, VR-M & VX-M
(screws 3.5mm x 12mm socket head)
(center to center = 26.11mm/1.028")
3520 3521 3522
YS .45 RF
(screws 3.5mm x 12mm socket head)
(center to center = 30.12mm/1.186")
3570 3571 3572
.60-.65 Engines ( 3/4"od Alum. tubing / uses - 5/8"id Silicone tubing)
  15° 1 1/2"
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Enya .61 CXLR S-Pro+TN
(Doesn't not fit older .60X R)
(screws 3.5mm x 12mm socket head)
(center to center = 26.11mm/1.028")
3580 3581 3582
Enya .60X R
(Doesn't not fit new .61 CXLR)
(screws 4mm x 12mm socket head)
(center to center = 33.91mm/1.335")
3590 3591 3592
K & B .67 (11cc)
(screws 6/32 x 1/2" socket head)
(center to center = 31.75mm/1.250")
3600 3601 3602
Irvine .61 RE
(screws 6/32 x 1/2" socket head)
(center to center = 36.02mm/1.418")
3610 3611 3612
Moki .61 R
(screws 4mm x 12mm socket head)
(center to center = 28.24mm/1.112")
3630 3631 3632
O.S. .61 VF, RF & Hano Special
O.S. .65 VR-M
(screws 3.5mm x 12mm socket head)
(center to center = 30.12mm/1.186")
3680 3681 3682
MVVS .60-.77 R
Fox 60R
(screws 6/32 x 1/2" socket head)
(center to center = 33.91mm/1.335")
3720 3721 3722
Rossi .61 (Old snap-on O-ring/
no ring & spring )
(snap id=.948 / o-ring id=.970)
3760 3761 3762
Rossi .61 (NEW non snap-on O-ring/
Requires ring & spring)
(o-ring slid-in id=.935)
3770 3771 3772
S.T.X. .61 (bolt on)
(screws 3.5mm x 12mm socket head)
(center to center = 31.34mm/1.234")
3780 3781 3782
Webra .61
OPS .60
YS .61-R (new Classic)
(screws 4mm x 12mm socket head)
YS .61-R (old long-stroke)
(screws 3.5mm x 12mm socket head)
(center to center = 32.11mm/1.264")
3810 3811 3812
Y.S. .60R (std stroke)
(screws 4mm x 12mm socket head)
(center to center = 32.11mm/1.264")
3860 3861 3862
       
.91 Engines ( 7/8"od Alum. tubing / uses - 3/4"id Silicone tubing)
  15° 1 3/4"
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K & B .82-1.0 (bolt on)
(screws 6/32 x 1/2" socket head)
(center to center = 31.75mm/1.250")
3880 3881 3882
O.S. .77-.91 VF,VR,VR-M,RF(bolt on)
(doesn't match the O.S. .91 RZ-H)
(screws 3.5mm x 12mm socket head)
(center to center = 30.124mm/1.186")
3890 3891 3892
O.S. .91 RZ-H
(doesn't match the O.S. .77-.91 VF,VRorRF)
(screws 3.5mm x 12mm socket head)
(center to center = 30.124mm/1.186")
3900 3901 3902
Rossi .91 R
K & B .82-1.0 (for O-ring)
O.S. .77-.91 VR (for O-ring)
(Old snap-on O-ring/ no ring & spring)!!
(snap id=.950!! / o-ring od=.970)
3930 3931 3932
Rossi .91 R
(non snap-on O-ring/ Requires ring & spring)!!
(o-ring slid-in id=1.088)
3950 3951 3952
       
1.2 - 1.5 Engines ( 7/8"od Alum. tubing / uses - 3/4"id Silicone tubing)
  20° 1.75"
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Moki 120 R
(screws 4mm x 12mm socket head)
(center to center = 35.20mm/1.386")
4720 4721 4722
O.S. 140 RX
(screws 4mm x 12mm socket head)
(center to center = 33.98mm/1.338")
(the Syssa 30cc gas engine may have the
same exhaust mounting, but we cannot
verify that it has the same port.)
4740 4741 4742-**
TT 120 R
(screws 4mm x 12mm socket head)
(center to center = 33.98mm/1.338")
4760 4761 4762
Webra 120 LS R, 145, 145 XP & 160 XP, UAV 1.2 LS - 1.45 SP
(screws 4mm x 12mm socket head)
(center to center = 38.10mm/1.500")
4780 4781 4782-**
       
1.8 - 2.7 Engines ( 7/8"od Alum. tubing / uses - 3/4"id Silicone tubing)
  20° 1.75"
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DLE 20 RA
(screws 4mm x 16mm socket head)
(center to center = 32.21mm/1.268")
4790 4791 4792
RCMK R254
(screws 5mm x 16mm socket head)
(center to center = 34.29mm/1.350")
4800 4801 4802
DLE 35 RA
(PTE 36 R?)?
(screws 5mm x 16mm socket head)
(center to center = 38.20mm/1.504")
4810 4811 4812
Quadra 42cc R
(screws 5mm x 16mm socket head)
(center to center = 35.00mm/1.378")
4860 4861 4862
Zenoah Q G-38 R
(screws 5mm x 16mm socket head)
(center to center = 36.27mm/1.428")
4880 4881 4882
       
3.0 - 4.8 Engines ( 1"od Alum. tubing / flex connector not included)
  20° 1.75"
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D.L.E. 55 RA (now available)
(screws 5mm x 16mm socket head)
(center to center = 42.01mm/1.654")
4900 4901 4902
       
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


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.