Quote:
Originally Posted by Sidekick
The Superformance mufflers are 2 inches dia inside. I replaced mine with 3 inch so as not to choke the crap out of my Roush 427. The stock superformance and other mufflers of the 2 inch size are really for a small block (or) around but not exceeding 400HP
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How do you like the mod. I will be sending my SPF side pipes out to mod them to a 3" dia this month, and really like the sound of the ones I've heard that have had this done.