Quote:
Originally Posted by gpvecchi
I had improvement in low torque. Perhaps it's because the STi muffler has longer piping than other exhausts?
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Maybe it's the throttle response from less restrictive muffler/piping that everyone is feeling. Piping length that far from the engine isn't going to make any difference. I bet back to back testing with the oem unit would give gains within the margin of error for a dyno. 1-2hp/tq max.
It's definitely an attractive part but the MXP SP is a fraction of the cost for a true cat back which makes it hard to justify the STi premium.