i have a 1999 banshee that i bought used 3yrs ago. it still runs great, but may have lost a little power over the years. im not sure what all mods have been done to it. it has t5 toomeys,k&n with lid removed,and port work. i checked the compression and have 140lbs. on both sides. i know thats pretty good but i dont know what i had to begin with,it has the stock head ,milled im assuming. im wondering if a new top end is in order? by the way my elevation is about 1500ft.