I prefer the sound and performance of the Dynomax Ultra-flo. The Flowmaster (435cfm) is louder than the Dynomax (1135cfm). Since the engine is nothing more than an air pump, logic told me to use the Dynomax Ultra-flo welded system for greater air movement.
I would also do more homework on the "H", "X", or "pro-chamber" systems. I've heard the Mac is a great system, also X-pipes, but I've heard the H-pipe is an older theory. So take your time and investigate further.
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