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Can't do both long tube headers and the solo cats, the bbk comes with high flow cats. You can do shorty headers and the high flow cats tho. The solo replaces both cats, with one cat and a resonator on each side. It bolts up right after the stock manifold, long tube headers move back the o2 sensors too far, but shortys don't. But honestly it's cheaper and has more gains to just get BBKs and use the high flows it comes with
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