I bought stock idles 40, and 98 Mains from Sirius Con inc. Everything else is stock (setting wise). I got the 4 into 2 swept exhaust, stock air-box with no cover and a UNI drop in filter. After syncing the carb's last night I ran the bike around town and it doesn't get much more perfect. Smooth through the whole rpm range. Pulls great. Doesn't smell like hell at idle. No hanging Idle. I cant believe how much of a difference the 98s made. From 90 (stock) or my 105's.