It seems like the clamp that came with the cat or y-pipe (can't remember)would be easier for disassembly purposes. I am not all that confident about getting a good seal though.

I have an SLP Y-pipe and Random cat. I could get it welded for nothing at the muffler shop I use.

Suggestions?

 

I weld my exhaust in every spot. Granted if you need to take it down you need to cut it but it can always be welded again.

 

Welding will give you a better seal in my opinion. I am using band clamps to seal up every part of my exhaust, but that is for the purpose of easy future dissassembly.

 

I have mine welded, less rateling noises.

 

You Should Def. Weld It. I Love To Weld. Its Cool.

 

If its welded then it will not be fune to have to remove for what ever reason.
I installed 3" 3 hole flanges on mine and could not be happier. I have no leaks period.
I have this one flange left over with gasket for sale $15.00 shipped anywhere usa.

 

I used the 3 point flange on both ends of the cat and ORP, so I can bolt them up when needed (emmisions tests ) if i have a leak there oh well..exhaust is loud enough to cover it up

 

Same here, I can remove my cat and bolt in my straight pipe in 10 minutes and vice versa. If properly installed with proper gaskets they will not leak.