It's pretty easy to do. I did it myself and it was my first time changing out a catback. Just make sure you cut the pipe near the top near the axle. And make sure you lube the rubber exhaust hangers too. I spent the most time on those, because I didn't lube them.
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2004 Black Mach 1
HP Twin 57mm turbo kit tuned by Modular Powerhouse
460rwhp/479rwtq at 7lbs with 10* of timing on a stock block 
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