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WEll I have SEEN dyno proof of a testpipe helping on turbo ludes and other cars.. as for NA if you do not have lots of engine work.. BEYOND just bolt-ons, I have not heard of any major gains, or losses with a test pipe..
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1994 VTEC
Eibach Pro-kit, KYB AGX shocks, AEM CAI, Greddy Header, AEM pullies, Thermal exhaust, Nuespeed strut tower brace, RPS stage II clutch, Random Technologies High-flow Cat.
Apexi V-AFC
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