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The Terminator
Engine/Tuning
Removing cats
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<blockquote data-quote="biminiLX" data-source="post: 16617900" data-attributes="member: 7795"><p>To answer the OP question, with free flowing exhaust and the rear/downstream oxygen sensors inactivated, no retune necessary.</p><p>May want to datalog or check WOT A/F and even see if boost effected (might decrease up to one full pound).</p><p>I actually think full aftermarket exhaust with cats sounds deeper. Removing the cats definitely makes it louder as it serves as a mini muffler. Only reason I prefer free flowing exhaust on performance applications, especially if boosted, is eliminating the risk of clogged/melted/failed cats.</p><p>I think the stink if no cats is much worse on pump 91/93 than Ethanol.</p><p>Good luck</p><p>-J</p></blockquote><p></p>
[QUOTE="biminiLX, post: 16617900, member: 7795"] To answer the OP question, with free flowing exhaust and the rear/downstream oxygen sensors inactivated, no retune necessary. May want to datalog or check WOT A/F and even see if boost effected (might decrease up to one full pound). I actually think full aftermarket exhaust with cats sounds deeper. Removing the cats definitely makes it louder as it serves as a mini muffler. Only reason I prefer free flowing exhaust on performance applications, especially if boosted, is eliminating the risk of clogged/melted/failed cats. I think the stink if no cats is much worse on pump 91/93 than Ethanol. Good luck -J [/QUOTE]
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