Which SB part number TTi headers did you install? Aren't there different models of TTi headers for each engine? Big tube, small tube, stepped tube, long, short? Eventually I'll need to replace my Hooker Comp headers (1-3/4" tubes, equal-length tuned pipes)... they hang a little low, and with my car already lowered, and doing more street/hwy driving, I need a little more ground clearance... but I still want the best headers.. favorably "tuned, equal lenght design". I do pylon autocross and more often for the future hi-speed road course lapping sessions/HSAX. T/Anks ahead!