Ben- is that you? THe yellow RX-7 from the Glen this weekend? If so, good to see you here!
Are you losing power? IMHO, yes.
The Racing Beat is a good unit, but there are better choices. First it is REALLY heavy. REALLY REALLY heavy...like well, well you get it. Look at the ISC stainless version. Smoother bends and much lighter. I think SDJ (you have a sticker on your car for them..perhaps you have an SDJ engine?) has a nice peice as well.
From there, a popular method is two pipes running back past under, (or over) the axle, then joining into a 3" pipe and the big Walker Dynomax stainless muffler.
The term "muffle" is stretching things a bit, because you can see engines exhaust ports if you look in the tailpipe! kidding...
I THINK the SDJ is an "early collector" system, check out their website. Call Mike VanSteenburg in FL for more info on the ISC unit.
That is a good basic system. Guys are doing some more "exotic" stuff out there with expansion chambers and experimental headers and such, but that will get you right on par with 95% of the RX-7s out there.
If it's you, good racing with you, and while my answers aren't worth anything, feel free to drop me an email (addy below) if you have any questions.
Go easy on the "professional speeders" such as myself!
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Jake Gulick
CarriageHouse Motorsports
ITA 57 RX-7
New England Region
[email protected]