[DanEC]

Not an FIA but 427 street car - running SpinTech low profile mufflers which are a baffled, straight through muffler. I like them because they are only 3 inches thick (I believe from memory) with 2-1/2 inch nipples and they sound good. That helps with ground clearance. Only issue may be that they are rectangular in section instead of oval like most.

I should correct - when I said straight through, that is not entirely correct. They are a baffled type muffler somewhat like Flowmaster mufflers.