I've heard good regarding accurateltd. just me I dont think going to 3" over 2.5" will reduce torque but in fact will gain some as any restriction past the collector hurts you, tho the big problem with a 3" system is noise control & I think added glasspacks alongside the rear leafs along with your choice of muffs up front would be mandatory for a 3" system & mandrel bends with any system. I've heard flowmasters can be raucous. tuned lengths/proper dia is primary tube territory. I think the absolute best is cable or vacuum (better yet) cutouts at the collector. Power (& noise) only when you need it & quiet the rest of the time (you will get along great with cops/neighbors) then when needed open it up & 10 seconds later the money will be in yours'(or a third parties') hands & they'll never know what hit em!