Rumor has it that the new dual EXUP system is pretty close to perfect - and if any exhaust mods are made, given the FI and EXUP situation, the best way is to go with just a slip on...Anyone have any feedback - my main concern is the sound - and if its adds a couple of HP that's even better... I just don't want to **** up the linearity or create a flat spot - with a slipon, are any other changes necessary (FI mapping etc)????