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I have one on my 02 denali and I love it.Installation is a breeze.I paid $450 cnd for mine brand new so if this is in good condition than I would say buy it.

Borala definitely sounds nice but it was a bit too aggresive for me.

I have the magnaflow cat back and it's quiet at cruise but if you give some go it sounds sweet.Inside you can only hear during accelleration but once you ease up on the throttle to cruise it almost unheard.I have a Denali aswell with dual 3 inch in and 3.5 out to a 4 inch tip.Wouldn't trade it...

I think that there will be some increase as the stock muffler is much more restrictive than any performance muffler. I wanted to try changing just the muffler on my Denali but my local muffler guy didn't want to do it so I bought a Magnaflow cat back system and have absolutely no regrets.

Leds are polarity sensetive.If you hook them up backwards all kind of wierd things will happen.

At 50 I'm getting between 19 and 20mpg.That,s in a 02 Denali with an atombuster K&N cold air and Magnaflow catback.Just installed the K&N on the weekend so I'm like you still trying to figure out if I've gained or lossed.

I run the magnaflow on my 02.It sounds great at idle ,cruise and accelleration.A little louder in the cab but not noticeable at cruising speeds.