mferry22

I have a 2017 Sierra that for the past month I can smell coolant every time I walk by the front of my truck. I'm not low on coolant, can't see any leaks and haven't ever noticed steam. I know my dealership will just say its normal as they have with almost every issue I've had. Do the bad radiators and thermostats extend to 17s?

I'll try that when I get a chance. Thx

My noise is back and more annoying than ever. I'll be bringing my truck back to the dealership. It was fixed for about a month

I had this noise for over a year on my 2017 Sierra. I had the steering shaft boot replaced and the vacuum pump replaced and I am happy to report that the noise is gone!!

I have one on my 17 Sierra, definitely makes in more responsive and you can dial in how much response you want. They have great customer service also. My controller was all scratched so I emailed them a picture of it and they sent me a brand new one super quickly.

I had this issue on my 17 Sierra, the only fix is to bring it to the dealer and have them update the nav. Its a common problem, search it up, there are a bunch of threads on this.

You need to go back to the dealer and get an update. Only way to dim it.

Also the 12909 is exactly what I was looking for, just bit louder than factory. I can see why some people think its too quiet but its pretty close to what my 2011 stock exhaust sounded like so I'm happy.

Well I finally have the muffler I wanted installed. I went to a different exhaust shop and had the correct muffler installed. The 1st shop completely hacked up my exhaust system. They installed a generic straight thru 15" muffler and cut off about 2 feet of the factory 3.5" pipe and installed 3". They also installed the wrong muffler backwards so the offset and center sides were switched meaning they had to bend the 3" pipe they installed. Anyway, after the right muffler was installed I went back to the 1st shop with the piece of crap muffler and demanded my money back. They gave it to me but they jerks about it.

Just got around to measuring my muffler, they installed the wrong one. The body is about 15 1/2". So looks like I'm going back to have the correct muffler put in. Not too happy.

Thanks, I'll have to get under the truck and measure the muffler.

No I have a 2017 GMC Sierra SLT with the 6.2L. Maybe I'm just getting old but I think its a bit too loud but the factory exhaust is ridiculously quiet, I can't hear it running from inside my house. I'm wondering if the gm performance exhaust by corsa would be quieter inside the cab because they tune the ANC with the exhaust. Its just an expensive price to pay if it's still too loud.

I still have the resonator. I just had the muffler replaced and the flapper valve removed. Does magnaflo make a louder muffler that would fit the 6.2? Is it possible the muffler shop put in the wrong muffler?

I recently had the magnaflow 12909 installed and the flapper valve removed and I think its actually a little too loud. I was looking for something just a bit louder than factory that is quiet in the cab when cruising. I thought my factory exhaust on my 2011 6.2 was perfect. Does anyone have any suggestions? I was looking at the gm performance exhaust made by corsa that comes on the all terrain x. Would this be louder than what I have now?

My 2009 was down 3 qrts and the oil light never came on. I found out because I checked my oil the old fashioned way.