3" exhaust? 2.5" exhaust...??

roccodart440 said

So you put 2 totally different systems on a car, didn't change the tuning, and saw no changes. In your mind this results in a theory proved true?

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Never said I didn't check the tuning. I spent the money and wanted an improvement. I don't think were trying to prove or disprove a theory here. I was just relaying my results. Results may vary. The OP asked for info.