I used a "Turbo Flange" on my exhaust set up. It works very well and only has one nut to tighten down and it seals it up. This would work very well with different exhaust set up's too. Here is example of what I got for my car :
3" V-Band Vband Clamp Flange Flanges Turbo Exhaust Stainless T70 T72 GT35 | eBay
I still used a little ultra exhaust sealer between but I really don't think it was necessary. I might have some pics but still don't know how to post them here! Regards, Matt