Quote:
Originally Posted by neilvosko
well, that helps. catless or catted doesnt matter?
, aftermarket systems are 2.5"+ inner diameter while OEM is 2.125" so i guess even catted headers is Stage 2 ?
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Stage 2 is meant for catless, as removing the cats give much more flow than just widening the pipe. You can use stage 2 for bigger pipes, or if you remove one cat, or a combination, but whether you gain or lose power has to be tested. Not everyone's car is the same, then there are mods on top of that. You will never know until you try, worst case you can just switch back to stage 1.
"Chasing speed with patience"