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I wouldn't expect much from secondaries. I ran some dynos with stock cats, with high flow cats and with test pipes on the primaries. I got approx 30 hp out of the straight pipe vs stock. Interestingly, same test results were achieved with high flows as with test pipes, so I opted for that. Much better smell wise with the high flows.
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Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive... |