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Old 09-22-2008, 05:28 AM
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Default RE: Tuned pipe for OS 61FX

A couple of opinions:

I'm not too sure that pipe (# 72101120) is actually the right pipe for for a 61FX...That particular pipe is designed specifically for the Hanno Special engine...

I've recently had three brand new Macs headers crack while running engines on my test stand...Mac's is using thin wall .035 aluminum tubing while OS uses much thicker .065 tubing...The thin wall tubing is very nice from a weight standpoint but I'm finding it just doesn't hold up very well...Maybe I just happened to get three bad headers in a row?? Maybe the side exhaust headers hold up better?? I'd recommend the OS header as they are very nice from a quality standpoint..

I'm not sure I really agree with the whole "pre-tuned" thing...Maybe call it "close enough" or "in the ballpark" or something like that?? I think you still really need to "tune" your exhaust for the particular prop, fuel and atmospheric conditions your running in...

In short..I'd get the Mac's 10cc quiet pipe and an OS header ...

Just my opinions...Have Fun..

Chuck