the bolt-on install isn't bad, there's a few bolts that become a PITA with the header on there, and you'll have to get some special tools to tighten them. What do you have to have welded up, the downpipe to the catalytic converter? You should be able to use muffler clamps and some adapters. Or you can have it welded. Do the install yourself, then take it somewhere to be welded.