Stock exhaust piping is not 2.25. Downpipe seems to be 2.25 or some of the sort. After the second catalyst is 2 inches inside diameter. Where the exhaust clamp is at and Rest of exhaust is 1 7/8 inches inside diameter.... just replaced everything after the second o2 sensor and did a straight 2.25 inch exhaust with a magnaflow straight thru muffler and tip. We just need that 2.5 Downpipe or something like that.
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