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Best you'll get to a V8 will be a high flow intake (like more than a cai), an off road h pipe, and magnaflow or flowmaster 40s that's about as close as you'll get. But realistically, an off road x pipe and flows will work, but I'm a magnaflow man myself. Yea I know, the GT has Flows, but if I could get my mags back off my old 98 sixer, I would so do it.