pre-cats.......... [ http://specialtyz.com/shop/default/sz-3-4-bolt-down-pipes.html ] Those ^^^ go between the turbos and the rest of the exhaust (before you get to the main-cats, resonators, mufflers). Or you can gut the pre-cats, but the above downpipes flow SOOO much more exhaust. [ http://www.ttzd.com/tech/precatstech.html ]
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