Mufflers

[gordster1122]

Purchased an 08 Grand Prix GXP picking it up Saturday the first mods are going to be is the trans cooler and shift kit and I'm looking for mufflers I just don't know what a good brand of muffler is for the gxp with minimal drone and is the pipe diameter 2.5''

[Fivefingerdeathpunch]

With a good resonator, they should be alright.

It'll still might sound like a helicopter if the DoD/AFM is still active. I have a dynomax muffler on my silverado with the 5.3 and DoD/AFM still working and I don't hear it much at all. Other say the dynomax sound good on these cars too.

[gordster1122]

I have the flowmaster super 44 on my 04 gp staying away from those way to much drone

[blueguy]

It's different with 8 cylinders...they don't sound as bad.

Go with Borla, Corsa, Dynomax, SLP...etc.

Keep the resonator, get a catless downpipe. That'll give you all the sound you need. As for the tune...get that and the trans cooler first and foremost. They're worth their weight in gold compared to making it louder. If you have exhaust and the DoD kicks in, you'll wish you hadn't when it sounds like a lawn mower.

[willie14]

I have the 44 series on my GP and the drone was bad untill I put my headers, 3in DP n Cat delete. Now it just sounds super aggressive on throttle and much quieter on cruising speeds

[blueguy]

I have the 44 series on my GP and the drone was bad untill I put my headers, 3in DP n Cat delete. Now it just sounds super aggressive on throttle and much quieter on cruising speeds

It's a 3800.

Were talking LS4.

Flowmasters sound awful on a 3800. This is not any new news.

[willie14]

I'm aware. I had a borla muffler on there which I thought that sounded pretty bad n bought the 44 series and with the exhaust mods I think it sounds great now

[blueguy]

Your ears are backwards, then.