Have loud drone between 2200 and 2800 rpms. Looking to have my muffler tech install 3" high flow cats in my SZ test pipes right before they narrow to 2.5" to fit the H pipe and cat-back setup. Q1: Is there enough room in the "tunnel" for cats that are 4" in outside dimension? Q2: What brand /vendor would be a good source for 2 high flow ( 300 cell ) cats ?
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best high-flow cats for 3 to 2.5 test pipes ? - TTkeeper15:03:55 11/23/18