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to get the optimum performance for any exhaust is mandrel bend. The crush bend restricts the air because it's not as smooth and free-flowing as mandrel. It's hard to find muffler shops that supports mandrel bend because the machine is expensive.
VRS most likely has mandrel bend.
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Joel S.
SE-R Spec V modded with:
AEM CAI, Progress lowering springs, Carbon Fiber Hood (on its way)
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