So, I have a leak at my exhaust housing and downpipe flange... Im running open downpipe so does this really affect anything ay all?

What kind of sealant can i used for my exhaust leak and it is not a good idea to use the same sealant on the turbo manifold?

 

exhaust leaks create turbulence and rob power, open dp or not. I would suggest having your downpipe flange resurfaced