I honestly do not know. But I am guessing they are not terribly different. My husband has the GMPP on his SS & I have Borla on my V6. They both sound great. Just get the one you think sounds best to you, or the one that best fits your budget. Either way I think you will be happy.
Here is a professionally done video of mine. Listen with headphones. Soon it will sound really different as I am adding ARH long tube headers, high flow cats & their new H-pipe set-up that is supposed to sound better on our V6's. I am keeping the Borlas.
Last edited by RubyCamaro; 02-04-2014 at 06:36 AM.
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