Slip fit exhaust clamps

If you're anything like I am with access to mostly generic exhaust clamps, you may have struggled sealing up slip fit pipes.  Ive tried lots, most recently walker slip fit stainless and was not satisfied with the result.  The pipes I am dealing with are 2" and a flare on one side.  

I was in at bmw and got to chatting with the guys, they gave me one of their bmw clamps to try and it holds very well.  As a result, now my 38 year old car has bmw waranty: