MagnaFlow Cat-Back Grand Prix GXP 16726

MagnaFlow Cat-Back Grand Prix GXP 16726

Item Code: GP5902

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Product Description

MagnaFlow Performance mufflers are 100% polished stainless steel and lap-joint welded for solid construction and rugged reliability even in the most extreme conditions. They feature a free-flowing, straight-through perforated stainless steel core, stainless mesh wrap and acoustical fiber fill to deliver that smooth, deep tone. Mufflers are packed tight with this acoustical material unlike some others' products to ensure long life and no sound degradation over time. Backed by a Lifetime Warranty.


  • 5.3L V-8, GXP
  • Dual Rear Exit
  • Polished Stainless Steel Tips
  • All Stainless Steel and Mandrel-Bent


  • 2005-2008 Pontiac Grand Prix GXP

Installation Difficulty

Installation Difficulty 3 View Installation Instructions


Average Customer Review 5 out of 55 out of 55 out of 55 out of 55 out of 5 4 Reviews
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4 out of 54 out of 54 out of 54 out of 54 out of 5 Had better..., 8.23.2012
Reviewer: Justin (Columbia, MO)
While this exhaust does sound great on my GXP, I've had better on my old GT. FloMaster makes a nicer exhaust. It's louder and deeper. But as far as the pros for MagnaFlow, it is a deep and mean sound.

5 out of 55 out of 55 out of 55 out of 55 out of 5 MEAN, 9.20.2011
Reviewer: Jeffrey (Stanberry, MO)
I have had this product for nearly a month now and it is awesome! Installation is easy with only a few necessary tweaks to make the pipe fit a little better. The four stainless tips look great and add a unique performance look. Tone is very deep and sounds great at both an idle and when laying into it; but, is still very quite when cruise is set at higher speeds, which is nice. I absolutely love this upgrade and would recommend it to any GXP owner.

5 out of 55 out of 55 out of 55 out of 55 out of 5 nice, 3.4.2008
Reviewer: david P (hazelhurst, WI)
Nice product went together easy. Tips are dual 4 inch that look awesome. I was a little disappointed that they didn't include the two bolts and gasket were its bolted to the cat. I'm pretty sure the bolts are 10mm by like an 1 1/2" course tread. The car has a nice deep sound cant wait to it gets broke in.

5 out of 55 out of 55 out of 55 out of 55 out of 5 GXP Magnaflow Exhaust, 6.27.2007
Reviewer: Bradley C (River Ridge, LA)
Excellent product. I've had it for a month now and love it. Great deep rumble at idle and sounds strong when you accelerate hard. Adds 22hp and 14lb/ft of torque. Can definitely feel the difference at higher RPM's.