Im getting a new cat-back system and was planning on just using the clamps that come with it but im wondering if its worth it to have it welded?

 

A good weld job will offer better sealing. Clamps have the advantage of offering easy disassembly and removal. There is really no right or wrong way of doing it.

 

I like the stainless band clamps. They don't crush the tubes. To keep them from leaking I spray some fiberglass weave cloth with copper gasket aerosol and let dry, then put around pipes under clamps. Works great for no leak, and can pull off for maintainence.

 

Is your car lowered ,or not?
If it's not lowered do you plan on lowering it?