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Muffler for MDS 46

Old 05-05-2013, 10:42 AM
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Default Muffler for MDS 46

Does anyone know if the MDS 46 muffler spacing is the same as the MDS 48?
Old 05-05-2013, 12:31 PM
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Default RE: Muffler for MDS 46

Nope, completely different. The 46 is about the same size exhaust / bolt pattern as the older Magnum / ASP 46, the 48 is the same as the OS FX 46, ThunderTiger 46 Pro, newer Magnum XLS.
Old 05-05-2013, 05:18 PM
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Default RE: Muffler for MDS 46

Thanks for that. I just looked on the Macs site and see the make an adapter plate for the MDS 46. I just want to try a different muffler as the original seems to be restrictive. I may have to make one to try some other options.
Old 05-05-2013, 07:10 PM
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Default RE: Muffler for MDS 46


ORIGINAL: turbo.gst

Thanks for that. I just looked on the Macs site and see the make an adapter plate for the MDS 46. I just want to try a different muffler as the original seems to be restrictive. I may have to make one to try some other options.
Jett can get you an adapter or custom drill bolt spacing on one of their Jettstream mufflers. If I were replacing a stock muffler, that would be the first place I'd go for a replacement. $65 and 1,000-1,500rpm gain easy. Mousse can pipes work great but still require a $30 header.
Old 05-05-2013, 07:36 PM
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Default RE: Muffler for MDS 46

The Jet muffler may fit OK. Measure your center to center hole spacing for the muffler screws and see which engines match up with it on the MACs website for their one piece mufflers. If it is a 46 engine size then the Evolution version of the Jett muffler will fit. That muffler is like turbo charging your engine as it is a tuned muffler.

Old 05-05-2013, 09:01 PM
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Default RE: Muffler for MDS 46

The Jettstream muffler keeps US workers working. They have several .46 sized mufflers with various bolt spacing. The tuning range of the red 40/46 muffler is 15,000-17,000, the Evo muffler being 1,000-2,000rpm lower.

Old 05-06-2013, 04:20 AM
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Default RE: Muffler for MDS 46

Yes do measure your screw hole spacing. if it is 37.08mm (1.460 inches) then you have may choices to choose from. if it is a bolt through setup then it is more limited though as you can't run the screws in through from the engine tabs and bolt on the muffler.
As shown on the Macs muffler website.
OS.40-.46 FX,SF, .46-.55 AX, .50 SX
-( also see the new .55 AX muffler #6720 )-
Evolution .40NT & .46NT-NX & Trainer A
ASP .46, GMS 2000 .40-.47
Irvine .40 & .46 (bolt through)
Magnum XLS.46
MECOA .40-.46, Royal .46
MDS .48 FS Pro (bolt through)
Rossi .45 (new)
Thunder Tiger .40 & .46 Pro
(screws 5/40 x 1 1/2" socket head)
(center to center = 37.08mm/1.460")

Now then I have a old almost new MDS .40 small case engine and it has a 32mm screw spacing though. The muffler has to bolt on as the screws don't go all the way through.
Macs calls it a "bolt through" type of muffler.
which puts it in this range of mufflers here:
O.S..25 FP & LA
Super TigerG .34 Aero (bolt through)
(screws 5/40 x 1 1/4" socket head)
(center to center = 32.11mm/1.264")


Old 06-26-2013, 10:33 PM
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Default RE: Muffler for MDS 46

Just purchased, installed, and bench ran this muffler.http://www.horizonhobby.com/products...01-a-EVO100601
I used gasket material from my local auto parts store to make a gasket and purchased the screws needed from my LHS.

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