hey i'm new to the forum so sorry if this has been asked before...

my buddy wants to sell me his stage 2 GIAC programmed ECU, do i absolutely NEED to have aftermarket downpipes for this application? what will happen if i run the stage 2 with the stock downpipes??

 

you don't need to have an aftermarket downpipe, but if you want a true stage 2 setup you need to be running piggies. Search piggie pipe, its an easy cheap mod so just do it.