You may free up to 5 HP with a cat back, but it won't be noticeable. Buy it for the sound and what puts a smile on your face.
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2004 GTO: IBM/Blue A4 (1 of 369)
K&N CAI, JBA shorty headers & catted mids, SLP LM1, Pred. tuner, ported stock TB and MAF ends, Derale trans pan cooler, 180 Tstat, TB coolant bypass, Hankook Ventus V12's, King 0" drop rear springs, drag bags, Monroe Sensa-Trac rear shocks, SLP rear sway bar w/ end link bushings, Lovell's RR bushings, BMR skidplate, tow brace delete kit, DEPO black tail lamps, SCSS pod w/Aeroforce gauge
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