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I'll add my 2 cents here. I have a 2001 Boxster S with a Fabspeed catback exhaust and a "mystery" tune that came with the car when I bought it 8 years ago. I only know it was tuned because the local Porsche dealer said it was not factory. I bought the intake kit from ESC (IDP plenum, 74mm TB and hose) and "though" I felt more midrange punch. Granted, the throttle response feels sharper but numbers don't lie. According to the dyno, I lost a few hp and lb-ft. A gigantic waste of money it seems.
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