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I agree 100% on this. Boost was way higher than you thought it was. The top of the gauge is 22 psi, but if you were already running that before the test pipe on a stock cat, you are probably peaking closer to 27 psi. If you were running a good high flow replacement cat before the swap to a test pipe, you are probably peaking around 25 psi now.... in either case you need to lower it a bit!
Keith
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EVO 11.53 @ 123.37, Black WRX Wagon 13.62 @ 99.24
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