I put on my dynomax ultra-flo cat back about two weeks ago. I just used the clamps they gave me and I haven't welded it. Is this a big deal. I don't think there are any leaks, but how do I tell? Should I weld it?

 

You don't have to weld, that's why they give you clamps. Welding is just more secure. One of my stock clamps broke one time and I was leaving home and stepped on the gas, I guess all the pressure push the I pipe off the Y-pipe and I had open headers for a few days when ever I felt like pulling the I-pipe off until I got it welded.

 

I prefer not welding any exhaust pipes. Its a lot easier to remove it when you want to. Just buy some high quality clamps and tighten them down good.

 

ya, if u want to be able to remove something and reuse it, clamps are better. and as long as u tighten them down good theres nothing to worry about. however, thats also a problem, it can be hard to get off pipes that have been clamped on because it usualy crimps the pipe, and u have to use heat, then a pipe expander to get rid of the crimp again. but if u plan on ever taking it off and reusing anything, clamping is the way to go.

 

What about straps? they won't crimp the pipe and they're wider so I'd get the impression that they'd be even more secure?

 

Though i do agree with all the forementioned ideas, i must add that in some cases you need a weld for a nasty rattle.. I had a really nasty rattle and the only way i could get rid of it was welding to tighten the whole thing up.

 

Yeah, even if you just tack weld it in a few places (in addition to the clamps, so you can break it loose later if you have to) it adds that extra bit of security and reduces rattles.

 

I have everything that doesn't have provisions for bolts welded on my system, and I can still get it out from under my car without a lift if I wanted to. So I prefer welding.