How much would it cost to put a magnaflow exhaust on my truck?

[runner]

I have a 1998 gmc sirrea and am thinking what it would cost to get a shop to put a magnaflow exhaust system in my truck. I would like to put a duel magnaflow exhaust on it but right now it has a single exhaust so if you could tell me how much a single and a duel would cost and which one is better thanks.

 

[fire_inur_eyes]

I have had a ton of 350 cu.in Chevy Suburbans. I get all my maintenance done at a shop where they also build race vehicles. So they know ALL about Chevy engines. They always put on a single 3 inch pipe with a mid range muffler---by mid range I mean slightly louder 2 baffles as opposed to 3. This set up allows for exhaust to flow better--AND maintain the correct back pressure. I had it re -done least year on my 1999, 350 . So-- with all new hangers, clamps--custom bent 3 inch pipe--muffler--new O2 sensor and new catalytic convertor---it was 900 dollars. Thats from the motor back to the rear in the stock configuration. Most people put new mufflers on old pipes with old convertors and never replace the sensor---thats why you will NEVER see any performance upgrades. Save up and have it done front to back and all NEW stuff. There's more to it than just noise!!