In Car WOT - '05 Pontiac GTO w/Magnaflow 3" Competition Series Exhaust

[chevelle454ss1]

want this set up for my G8

[SC04Cobra]

I am really looking to trade or sell my Cobra for a goat... The only problem is idk if that is a good decision. I love the look of GTO's way more and I know the value will go up over the years with them as well as my 04. Any advice? I know you can't make the choice for me. Just wanna know how you like the car.

[1967Fuelie]

Yea I'm looking for that more pronounced, deeper tone. I'm just running the stock cat back and when I hammer it, it almost sounds like baffles are lose. It has that raspy sound between gears and that has got to go! I was also looking at the Exhaust Depost systems as well. They sound awesome for a great price, but not stainless : ( I will probably got with the Magnaflow 3" Yes, I have the SW (1st gen) headers, high flow Magnaflow spun cats, vararam intake, LS7 clutch, and a tune.

[1967Fuelie]

Thanks for the video. I was wondering what the competition series sounded like. I also have SW headers and Magnaflow spun cats. My only worry is losing power by going to a 3" exhaust. I've read that 3" isn't necessary until you're in the 600-700 hp range and up. It has the sound I'm looking for though. Decisions, decisions...

[Dammer71]

The changes in exhaust velocity are probably minimal, so you're really not going to gain or lose any HP by going from a 2.5" to 3" cat-back system. You will get a much louder, deeper tone though (especially if you're currently running the stock cat-back). GM is putting a 3" exhaust on the 2012 Buick Regal GS and that's only an inline 4 (turbocharged) producing 255 HP. If you've got headers, high flow cats, and a tune, you should be making around 420-435 HP - plenty to support a 3" system.

[Dammer71]

My old system droned a little around 50 mph. Drone with this system isn't really any worse. After a cold start-up, it will drone around 30-40 mph. It gets better as the car warms up. Of course a little strategic gear selection can help too. Overall the 3" system is definitely louder inside the car though.

[dingle1919]

what's the drone like? i imagine the 2.5" would be a little more subdued?

[GMpowerLS2]

nice