Try hottexhaust.com

Magnaflow 16726-Magnaflow Exhaust System-Chev/Pontiac Cars-Hottexhaust

Use discount code: chgp1

It should be
Sub Total: $762.65
Coupon Discount: -$205.92
Sub Total: $556.73
Shipping is free... Probably no sales tax depending on the state you're in.

So yes. I challenge you to beat that.

FYI: List is $976.97