need a test pipe anything i guess 2.5 or 3 inch doest matter show me what u got need one today. need it fo my s14 exhaust …my other one is shiet
they have them on ebay for a good price…or you could just make one 
i got one from jason (hustler) for dirt cheap. does the trick, also has cat sensor bung built in.
hm still looking…anyone got one fo around 40 bucks …iono …i;ll even take the stock cadilac conver…