STS with or without cat's and headers?
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Ok does STS work better with headers or manifolds and with or without the cat's? What sounds nice as well? I've been debating the pulse & velocity affect with and without cats and am unsure of the best combo.
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I have Mac off road pipes on my (delete cats). When I first put them on, it did feel like it made a difference, but I haven't had a chance to re-dyno to see the actual #'s. I'll tell you it got a lot louder without the cats.