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Glad I didn't have to respond in person to your rebuttal. I would've said "ah, um, don't know" See if some of the exhaust experts like sammy and gr8titan can answer that X-pipe question for you. I bought the dual Borla XPs without a built in cross over. I noticed the lack of back pressure the minute the duals were installed. As soon as the x-pipe was installed, I was cooking like wessin. If you don't notice any considerable lag time between stomping on the pedal and take off your probably okay. In my case, it was very, very noticable. Also felt like the truck had a weird pulsating sensation. Good Luck.
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