Ok well i already have a 2 1/4 cat back. but i am going to put a header custom d/p and test pipe on. I will be putting on a short ram same time as the header. Shortly i will add a piggy back and underdrive pully. But will that be too much for my exhaust? should i leave the cat on? i will adventually go turbo after i pay off my car but should i put the test pipe on or leave cat on?

 

Leave the cat, if you're smart. Save the test pipe for when you're turbo.

 

I have a question though. On my rrm header and test pipe there is a threaded hole on each. What goes there? i bought them used from somebody else. I just dont know what goes there. And im sure its not a good thing to put it on with nothing in the hole

 

sounds like thats for the o2 sensors!!! but it seems like its a little hard to not know what those are for...

edit: haha imagine what would happen if you had nothing in there, that would be interesting

 

+1, He's right, dont go too much exhaust. Better off with Piggy and Crank Pulley. Your going to need the backpressure with the exhaust you already have.