Not all exhaust systems are going to yield massive results... some are rather poor actually... the Fast intentions seems to have the highest numbers with a full CBE with test pipes getting about 25 or so whp.
I myself would likely go with their exhaust with the Motordyne ART test pipes, their pricey, but they aren't as loud as test pipes, but have gains over all test pipes so far that i've seen... but there could be some out there that do better.
The more expensive exhausts are USUALLY expensive for a reason... they get results.... but that's not a hard and fast rule either.
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