Well Im a newbie on this site so i dont know if this reply goes to everyone who commented or just to stestrglde the last one who replied?... But here it goes.....I did not put any packing back in at all, as I heard a bike with the 2.0 cores installed on a identical bike to mine and did not think it was at all to loud....as many people on this site i think im looking for maximum sound out of my 110 cu without drowning out my sound system...I fm glad to hear that it will putla little more sound out after cat is out...(I figured it would) I never did check to see if i would void my warrenty by putiing cores in myself?

?? Surley not i would think....Im sure i could handle the x pipe install easy enough...but the tuner has me a liitle freaked out....warrenty and my limited computer skills ...lol...I will check with dealership (Worth HD Kansas City) I talked to a wrench who said he was very impressed by whole fullsac system...he has put in the stage II kit with the andrews 254h cam and said the specs werent far from the oem 255's once again a little our of my mechanical real....but trust his experiances...i guess after after the exhaust system start looking at cams......thanks for the replys learned alot,,,Hammbone