I am selling my Challenge Engineering X-Pipe Race version (Catless with Resonators) for a E9X M3.
I bought this from GTB Performance in March this year and haven't taken it out of the box. It's been sitting on a shelf in the garage and I never got around to installing it so I might as well sell it.
I paid $1,700 for it new and I'm asking $1,500 for it O.B.O.
Post here or PM me if you're interested.
Link to the X-pipe on GTB's website http://gtbperformance.gostorego.com/...ss-e9x-m3.html