Headers connect to the heads, then the midpipe connects the headers to the catback. So the exhaust system is really 3 separate pieces. You can put in the midpipe (X pipe) whenever you want.
Now you shouldnt be welding your exhaust at all. If he welded the catback to the midpipe then youll have to cut it where he welded it and put the stock clamps back on. All exhaust stuff is bolt in, not weld in. Except in some cases where you need to weld the midpipe together such as Dr. Gas x pipes.
If you get an o/r (off road) midpipe then that means it doesnt have cats. This is perfectly fine, however, its not legal. But many people run one anyways. You probably wont be able to pass inspection with it or emissions depending on how its done where you live. So when that time comes, youll have to put the stock one back on. Also, if you get an o/r pipe then youll have to get mils. These turn off the rear 02's that are used for emissions. Another way, and even better way, is to just get the rear 02's turned off via tune.
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