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Originally Posted by dknv
I can do catback exhaust & stay in stock. That's what John & Patty have done with their yellow WRX (but not mandel bend which is supposed to be a cleaner flowing setup).
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Yeah, mandrel bent pipes are bent so the inside dimention of the pipe doesn't change, whereas the alternative is just to bend the pipe, which pinches it at the bend. You need a big ol' machine to do mandrel bends... or one of these:
