End of next month the I4 is getting a new exhaust system. WIll be a custom built cat-back, probably 3-3.5" pipes, either a Borla or Bassani muffler system and a side by side dual exhaust. Once that's done, it will be going on a Dyna for tweeking the CPU to maximize the new exhaust. All this for $375.00 out the door by Exhasut Systems Hawaii & Team TRD, Hawaii. Still might not match the V6 but, according to my tech, he wont be surpirsed if it tickles the 185 HP mark on the dyna, but we'll have to wait and see. The way I look at it, for $375.00 it's worth it.....