My 2001 gsr swap didnt come with a exhaust manifold or cat so I need to buy a exhaust manifold and cat to do the swap in my 2000 dx hatchback with stock exhaust.I know with the gsr manifold+gsr cat its going to have about a 3 inch gap between the cat and b pipe? If I brought a itr header/cat would this solve the gap problem since I (heard) its a little big longer?

 

using a 99-00 si header will solve the gap issue. well at least for eg's it does, but if i were you, i'd get a jdm itr or dc 4-1 header and have an extention welded on.(after the cat)

 

I need to know

 

GSR mani should work, but an LS will deffinately bolt up and have no gaps. I have one for sale right now if you are interested.