What test pipes?
And assuming you mean the Z1 ported plenum? I could tell a difference in my car, but I did the lightweight flywheel and the plenum at the same time. The car felt much more responsive and revved noticeably quicker, but I can't give you any real idea on actual power.
As for adding power, the test pipes are going to be your single biggest gain. They're the restriction in the exhaust. From there, an intake(Z1, SOHO, or Stillen) and then having the car tuned by a reputable shop to get the full potential. Again, Jon @ Z1 or Nik @ SOHO for tuning.
If you're wanting more power than the standard ~340, just save your money and go boost.
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377whp/299wtq NA
704whp/519wtq, SOHO stage 2.5
IG: pearlywhite.z
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