I was running 2"Rush on my 08seuc w/stock head pipe,sert & remap. Changed to2.25" Fullsac & the temp. increase was huge. Dynoed w/2.25 & ran much cooler--the same as the Rush. Loved the sound,but had several problems. Alot of blubbering, back-pop on deceleration. Cough back through intake upon start-up. Smelled rich @start-up. After setting through a red light,starting to take off bike would cough & die. REally a pisser ! I thought fuel was too rich--maybe a little over-tuned? Bike would run like a scalded cat& put out 98hp &123ft/# torque!! Talked to my local tuner & Steve @ Fullsac. Local tuner said put in 2" baffles & probably solve problem, not enough back pressure.Fullsac said maybe,but could be 02 problem. Put in 2" Fullsac, not much sound difference,& with only 10-15mi & 3 start-ups seems problem solved. Time will tell..