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You must dyno-tune and re-program ECU to get any improvement at all from exhaust. Then again, you need full-exhaust for gains. Just muffler swaps won't give you much, if anything at all.
True, you aren't going to gain much power without going with a full-system and tune.

I replaced the stock muffler on my SV because it was HUGE, heavy, and just too quiet for me. The Delkevic has a removable baffle that I have in, but modified it for a volume level between with and without it.

Didn't notice any power increase, or flat spots in throttle response, just better sound mostly.

It sounds faster!
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