'98 project car

[ike84]

Nicely done!

I'm curious, do you have pics of the specific headers you tested? I'm curious to know if there's much of a difference in piping diameter or if the only real difference is the lack of cats.

Also, did you make any intake adjustments between the test? Maybe I missed it, but what intake setup did you use?

Also, for your AFRs, it looks like you're running around 11ish? That's standard programming for our ECU to run at WOT (or at least that's what my 996 tune does). It will be quite tricky to tune that out without altering the maps.

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[Lemming]

Headers are from Electrodyne, they had a black Friday sale that came in handy (35% off), midpipe catless headers are from Circuit Werks (non resonator version).

For the intake I have a 987 Cayman S airbox, custom intake piping and a 996 mechanical throttle body. Nothing on the intake side was changed between dynos.

Most of the A/F is 11.75-11.5, the only time it's near 11 is at 6K rpms. In contrast, my SPB (2.5L stock intake system and exhaust headers) runs from 11-10.5 throughout the RMP range.