I have a good connection with a local company that does mandrel bent exhaust for OEMs. I'm thinking about developing a bolt in exhaust system (collectors back). All cnc mandrel bends, no crimping in the bends. Would use leak free ball flanges or slip fits at the connections. So no welding needed. Possibly stainless option? Any interest? If I can find any local folks (NW Georgia) to partner up with I'd be willing to provide some free samples for test fitment. For now id probably stick with 67-up.