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Long tube headers installed! Now what?
Well my TSP long tube headers are installed and car is tuned! Only 1 minor issue. I had flowmaster exhaust on it before. I didn’t want it too loud so on the shops advice I put factory exhaust from high flow cats back. I didn’t realize that this exhaust came from a convertible which means L99 not LS3 which means large resonator in front. The shop says this is robbing me of approximately 10-15 whp. What are my options? Cut the resonator out? Get and X or H PIPE? Do a different cat back system? Thank you!
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