Originally Posted by C ///M
Interested and local.
Sorry I'm not that familiar with the e9x M3 exhaust specs, but what is the inlet/outlet size for these? 2.5"? Also, I assume they are a straight flow-through design?
bump for OP;
yes they should be 2.5 diam; IMO these look like Vibrant brand, so you can look up specifici specs there and I would be hard pressed to believe Challenge makes their own resonators.