How do you replace the front flex exhaust pipe

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Hi! I need to change out the front flex pipe, it has a leak, and I now sound like I drive a Harley! YEAH! :) Looks like an easy enough change out. Is there any welding involved? I took it to the shop, they made it seem like it was a pretty easy change out, he was willing to do it at end of day......so seems like something I can do, as save a few bucks. The part is cheap, itself. what ataches it to the pipe? thanks!!!