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Make sure to double check, but...

Look at Muzzy & Scorpion. They don't require jetting or mapping. A true slip-on.

also, check this out: http://street.parts-unlimited.com

If it's made for a bike, it's on this site!!!

 

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you'll prolly have to make your own. aftermarket companies wouldn't make anything that complicated since the stock muffler and valve are welded together. I don't know a whole lot about exhaust valves but I've heard they are there to keep the noise down more than for backpressure. I also own an '05 636, I run it straight pipe, (with a servo motor bracket to keep the FI light off), loud *** hell but it doesn't run lean or rich and i didn't feel like I lost any backpressure or power. good luck guy and let us know what you figure out.

-ex

 

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You will notice a difference with engine management when playing with exhausts. Because everything is tuned as a package for best results. It is your ride, so enjoy.