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SVT Shelby GT500
Mrt h-pipe with cats for 07 gt500
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<blockquote data-quote="Shaker1" data-source="post: 14894948" data-attributes="member: 4863"><p>In the state of Illinois you cannot pass emissions without cats. Do not know about MI, but you may have to put them back on and re-tune for emissions periodically.</p><p></p><p></p><p>You can probably pick up 10-15 HP without cats, but I can often tell when I am behind someone without them. Catalytic over temp is frequently turned off in aftermarket tunes. I asked Jon Lund and he told me he routinely turns it off. I had him turn mine back on and asked what impact it might have. He said none unless I am driving it real hard, then it might shave 10 HP to "save'" the cats from melting. </p><p></p><p>My opinion is that unless you are looking for every last 10th you are better off with cats and COT turned on. Agree that stock cats are the best out there.</p><p></p><p>If you can find a tuner who can set you up for emissions readiness without cats, it may be possible to run no cats and pass emissions readiness, or so I am told.</p></blockquote><p></p>
[QUOTE="Shaker1, post: 14894948, member: 4863"] In the state of Illinois you cannot pass emissions without cats. Do not know about MI, but you may have to put them back on and re-tune for emissions periodically. You can probably pick up 10-15 HP without cats, but I can often tell when I am behind someone without them. Catalytic over temp is frequently turned off in aftermarket tunes. I asked Jon Lund and he told me he routinely turns it off. I had him turn mine back on and asked what impact it might have. He said none unless I am driving it real hard, then it might shave 10 HP to "save'" the cats from melting. My opinion is that unless you are looking for every last 10th you are better off with cats and COT turned on. Agree that stock cats are the best out there. If you can find a tuner who can set you up for emissions readiness without cats, it may be possible to run no cats and pass emissions readiness, or so I am told. [/QUOTE]
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Mrt h-pipe with cats for 07 gt500
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