I have the 17749 Super Turbos on my '64 GTO convertible - they are a 2.5" inlet/outlet muffler. I have an X pipe and the exhaust is 2.5" all the way including the 2.5" RARE RA exhaust manifolds.
Selected these mufflers so that I didn't drive myself crazy with the top down (which it is 95% of the time).
I'm very happy with the results.
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