Go with MAC exhaust! It sounds wicked.
I got a C&L 76mm and have to say the quality looks top notch. I know they work differently than the Pro-M's do, but there's a lot of guys running the C&L too without any problems.
Plus, if you decide to change injector size you can usually find someone wanting to swap sampling tubes and save a bunch of money.
I'd switch to long tube headers as well.
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