A nice compromise I found was getting a high-flow resonator. It's 2 1/4" in diameter (same as the rest of the exhaust), while the SVT resonator is 2", and is the main restrictor. It flows real good, and coupled with a KKM, gave me a 14hp gain over stock, on a DynoJet.
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You really got 14hp gain with only removing the stock resonator and with a KKM??? That's it???