So I just installed a Akrapovic titanium header and muffler without Cat. Disabled and removed 02 sensors, went with a K&N filter and bought the Rexxer user so I could go with multiple maps and make changes in the future. I must say I'm very impressed with this combination. Very smooth with good power increases across the board. Easily pulls the wheel off of the ground in 2nd gear without effort and runs cooler. Now it's time to work on the suspension and then paint.