exhaust mods can be tricky. You've got to remember that to get the best performance from an engine, both the intake and exhaust have to be considered and the intake-to-exhaust flow ratio affects performance and should be in a mathematical ratio designed to put the performance/power where you want it. Putting on too large of an exhaust can impact performance, as can one that's too small. Tubing length, diameter, bend restrictions, muffler volume, size and shape all play into it. Toughest part of it is that there's no easy way to tell what kind of change you've made unless it's so drastic that the seat-of-the-pants lets you know for sure. Rare occurrence! Just like modifying the intake with a Uni etc., changing the exhaust will likely require going back into the cab to re-jet.
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