GSR Header to LS... I know, it's been discussed before.
I have done the search and found a couple of threads on the same subject, but I think mine is slightly different than the rest.
I have a 94 LS 2 door coupe. I plan on buying my friend's 5zigen header that he bought for his GSR, but he unfortunately wrecked it and has the new part in his basement, un-installed.
Anyways, I can get the header at a steal of a deal, and I also found a website with a 5zigen cat-back exhaust for my LS for a good price as well.
To make the 5zigen header fit, will I have to get a GSR cat, or am I basically forced to make/buy a test-pipe?
I appreciate any answers.