what is the best bang for the buck evo 8 motor with evo9 turbo 10.5 with ported manifold stock dp and 3" apexi cat back which o2 housing you guys think I should get.

 

First off, you HAVE to get an aftermarket downpipe to take advantage of this. Opening up restrictions further up the chain won't help if there's restrictions further back in the exhaust. I have the buschur ceramic coated SS o2 housing. I'd say the Megan would be your best bang/buck, but personally I would buy the buschur again, because I have seen some inconsistent o2 housings out there from megan as well as others. With the buschur unit you know you are getting the one you want, and the welds have been inspected to boot.

So, order o2 housing and downpipe at the same time Do you have a testpipe yet? Get one of those while you're at it!