3" J Pipe is only compatible with E series Race intercooler
The factory J pipe is 2.4" and in some 2010+ models a one piece design. The 2.5" J pipe is suggested for models that have the one piece design while the 3" J pipe allows you to stay 3" all the way from the intercooler to your throttle body when equipped with a 3" BMS chargepipe for the highest flow potential. We suggest the 3" J pipe for vehicles with aftermarket turbos.
