I have both a new Begi downpipe similar to one from the BEGI-S kit and a used FM downpipe. Both have 2.5" outlets. Check the pics below. Both have 2 sensor bungs that can be used for your wideband & narrowband or you can just plug the one you're not using. The FM one will need 2 additional studs and 4 nuts to join the 2 pieces together. The BEGI one is just a slip fit. Neither is stainless. Fits 5-bolt T25 turbos and 94-97 Miatas.

Price is $250 obo for either one. I will sell whichever somebody wants first and then use the other one myself.

 

it would probably be helpful if you shared what turbo and vehicle these fit.

 

Good idea! Fits standard 5-bolt turbine outlet on T25. The downpipe-to-cat flange is for a 94-97 Miata. It may be easy to make it fit other years, but I'm not 100% sure.