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I've never heard anything like that....only the best about Spintech. I've seen dyno tests showing an '04 GTO gaining ~30 RWHP over stock with no changes besides a Spintech catback.
I'll look around and see if I can find anything else about them.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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