Dissapointing performance

T-N-T said

Then why did you post this???

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Collector is 2.5 that tapers fast to 2. I did it that way because my exhaust size is 2". Now when I update to 2.5 exhaust pipe, I need only cut inch out of collector and weld 2.5 flange, then collector is 2.5 and exhaust pipe too.