Why is it that everyone seems to get wood over Rhineharts and 'True Duals'? Every engine builder I know or have known has told me the the use of a cross over increases torque, and changing the distance from the heads will affect where the torque improvements start in the rpm range. I've got V&H on mine, have been there for almost 50K miles now. No yellowing, no Blueing, no discoloration what so ever. I picked up an '09 SERG on E-bay, should be here in a couple of days. The only thing I'm waiting on is the new version of the V&H 4" turndown mufflers. V&H has told me they'll me available mid-December. Plan on matching them to the V&H Power Duals, and adding a Super Tuner, and a 'Heavy Breather' air cleaner.... unless I can find a K&N replacement for the stock air filter.