[tjd24]

We've got a '07 G6 HTC as well and recently started experiencing a whistle or screeching noise when accelerating. We recently put on new rotors and pads so I first thought it was the brakes but then realize its only on acceleration.

I am taking in the G6 in on 9/22/10 to get the roof button replaced (pressing button would start retraction but stop after a few seconds which then required button to be re-pressed) - I've printed out this thread to show Dealer Service to have them check out my issue - I'll post results as well.

 

[tjd24]

Brought the G6 HTC in for service on Thursday 9/23 - Tech told Service Manager that on his test drive he heard the whistling/squeal - checked belts, PVC value as A-OK - had a Tech rev the car while on the jack and heard whistle through the exhaust system. Wasn't clear whether it was at the resonator or Cat - they indicated a replacement exhaust may correct but they said this is common with G6s.

At 27,000 miles it doesn't need a replacement cat-back so we'll just turn up the music...

 

[tjd24]

I'm going to Midas to have them take out the resonator and put in a Magnaflow 10425 Stainless Steel Straight Pipe Muffler. I'll post how it sounds when its done and if it fixes the problem.

Thx - let us know - the squeal is driving me nuts - also tell us what you paid for the Magnaflow. Much appreciated.

Here's the link to the Magnaflow product info http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=9246

 

[tjd24]

Magnaflow 10424 fixed whistle

Many thanks to slls, ballerinda and x44+ for their posts on replacing the resonator - just had the Magnaflow 10424 (purchased from [ame]http://www.amazon.com/Magnaflow-10424-Stainless-Steel-Muffler/dp/B000XQQ08C[/ame] ) installed by my local Midas shop (about an hour labor). Prior to hearing the OE resonator the Midas tech wasn't sure that would be the cause but when his boss reved the car he clearly heard the whistle at the resonator. After cutting off OE and welding new resonator the result = no more whistle. The car sounds fantastic, good strong but not obnoxious note at rev and restored my for our 2007 G6 HTC.

So for ~$68 for the resonator and an hours labor thank God the whistle is gone.

 

[tjd24]

My wife's 2007 convertible developed the whistle and I found this thread. I ordered the Magnaflow from Amazon and set up an appointment with a local Midas shop. They had the car on the lift about 30 seconds, came and got me and said look at all this...pointing at what I'm assuming is bracing to stiffen the convertible...and said this is at least a 4 hour job to take all this down and then do the resonator. I told them to drop the car and I'd get it done later, because I did not have that kind of time and I didn't trust they knew what they were doing. Am I correct in assuming that the bracing is not a big deal and they should be able to replace the resonator as easily as a non-convertible? Thanks for your help.

Our '07 is a Hard-Top Convertible (HTC) and my Midas shop did not have to touch the bracing - they did the work in under an hour.

If your shop needs to call my shop their # is (973) 579-1030 - Midas Newton NJ.

Had this done back in April - their best welder did the work - owner will know his name.

 

[tjd24]

I can get it for 60.00 right now with free shipping ? 2008 G6 GT Conv.

http://shop.advanceautoparts.com/we...ape-inlet-diameter--2-in-magnaflow_22316231-p

Great price - amazon is now $73.25 with free shipping - [ame]http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Magnaflow+10424[/ame]

As you saw in my posts this fixed the issue and hasn't come back - also note Midas took less than an hour to install so if your shop says anything different challenge it. Good luck!