Grimmspeed J-Pipe Heat Shield Direct Fit for GrimmSpeed V2 GESI-Catted J-PipeGRM 092009 The factory FA20 J Pipe has heat shielding built onto the pipe to keep exhaust heat away from nearby critical components like the water pump, lower radiator hose and serpentine belt. A lot of exhaust heat is retained by the catalytic converter in order to make it function properly, which is why having a heat shield over the top of the cat is so important. On our Version 1 J Pipe, the cat was located at the rear end of the unit, so heat