Originally posted by ITSRX7:
The header, expansion chamber and muffler set-up they sell for ITS RX-7's. I had a Racing Beat header into a custom 3" into the same muffler they sell (Ultra Flow)

AB
Very interesting. Do you know:
1) Does the header contribute significantly to the improvement? and
2) Is the expansion chamber compatible with the RB header?

Do you have (or have seen) comparitive dyno runs? Curious about how the torque curve changes. I'd expect the expansion chamber to be tuned to an RPM band, like you get with two-stroke bikes - different pipe for low or high end.

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Marty Doane
ITS RX7 #13
CenDiv WMR