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my monte with LT's and true dual exhaust with dual 3" cats ran like crap and had horrible bottom end. I finally switched to a new header back system with a single 3" cat, and runs great. Before i had too much flow, and some engines need the backpressure. so even if you have 100% flow with !CAT, its probably hurting the performance more than anything. I'd liek to hollow otut he cat in that car just to get the sound a little louder but i dont wanna risk messing with the flow again.
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