a few Magnaflow mufflers....... We stopped offering them when we started getting the Sebrings made with the offset center. We found that by just straighting out the two rear bends on each side we could make an extra 13 RWHP and 23 RFPT on a 400 RWHP car :) The math is that every 90 degree bend has the same effect of restriction as adding 25 feet of straight pipe.