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Message: <blockquote data-quote="kintek" data-source="post: 604531" data-attributes="member: 9500">I have a 03 Cobra exhaust and some Flowmaster Super 40 mufflers to replace the factory mufflers. My question is how would I turn these into dumps because I do not have a IRS. Or would I be able to shorten the back pipes so they come out of the side and keep the back pressure like i need it. I am adding these onto my 3.8 motor. I know I have to plug the factory o2 sensor holes above the cats on the exhaust, since the exhaust headers have o2 sensors already. I am trying to figure this out soon, want to get it finished up before the 19th. I am hoping to start driving it soon.The factory sixxer exhaust is short to crap, not enough back pressure for the motor to run properly. It sounded like junk when i got the stang and before I did this rebuild.Thanks for the help.</blockquote>