Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

2 hours ago, Jmonty said:

Any drone? How much louder did it get?

There is a little, I'm not sure if it's any different than the GM Cat back system. It doesnt bother me at all. I kept the flapper valves just in case and I have no intention of welding them back on. 

Share this post


Link to post
Share on other sites

I just put on the GM cat back system this morning...really solid. I can't compare it to what people are getting by just replacing the muffler and cutting out the flappers, but I will say that I'm really impressed. Lots of balls when you're into the throttle, very subdued at highway cruising speeds (I suspect this is largely due to the 10 speed keeping a low RPM when you're not passing somebody).

 

Great balance. Went on super easy.

Share this post


Link to post
Share on other sites
13 hours ago, SierraAT4 said:

I just put on the GM cat back system this morning...really solid. I can't compare it to what people are getting by just replacing the muffler and cutting out the flappers, but I will say that I'm really impressed. Lots of balls when you're into the throttle, very subdued at highway cruising speeds (I suspect this is largely due to the 10 speed keeping a low RPM when you're not passing somebody).

 

Great balance. Went on super easy.

I have been contemplating the GM cat back and installing it myself.  When you removed the OEM exhaust, did you have to cut it to get it out?  

Share this post


Link to post
Share on other sites
Posted (edited)

Ok, so we got it out without cutting it, but this was on a lift with two people manipulating the exhaust back and forth. It takes a little tetris/gymnastics to get it out of there in one piece, but it is 100% doable. On the ground or on jackstands? I'm not sure I would have bothered trying to get it out in one piece.

 

Of course, once we got it out and realized how long it was, and I had no easy way to transport it (and no real potential to sell it, it's likely going to end up at the recycler), we ended it up cutting it just past the second flapper so I could stick it all in the bed of my truck.

 

My advice would be to just cut it out with a sawzall, one cut will make pulling the old one out 10x easier. And then the new one goes in exactly as you would expect it to. There aren't any instructions in the box (other than to consult the official accessory service manual, AKA have your dealer do this), but you really don't need any, it pretty much fits together and hangs perfectly. Keep the existing clamp from where the flex pipe connects up toward the front, you'll reuse that one, everything else is in the box.

Edited by SierraAT4
  • Thanks 1

Share this post


Link to post
Share on other sites

How loud is the performance exhaust in the backseat when you are pulling a trailer and the engine is running between 2600-2800 rpm? 

Share this post


Link to post
Share on other sites
On 3/18/2019 at 8:36 PM, SierraAT4 said:

This video convinced me to buy one: 

 

Thanks for that.   I hadn't seen it before, but it consistent with the difference I saw when adding the exhaust and cold air intake.   My understanding is that it is the Borla exhaust branded as GM.  $2,000 for both installed, but a nice upgrade.

 

Share this post


Link to post
Share on other sites
On ‎2019‎-‎03‎-‎21 at 9:44 AM, brothernov said:

Would it make any sense to only add the cold air intake, or only the exhaust?  As I type it it feels like a dumb question, if I increase the air in I'll probably need to increase the trucks ability to expel it, but I know practically nothing about exhaust systems.

Yes. This is what I do with my personal trucks. I put a cold air intake in them and leave the exhaust stock. That way, I only hear the engine noise under load, under normal driving conditions it is silent. This allows me to go on long drives with ZERO exhaust drone. I had a Magnaflow muffler in my 2010 and it was droney, I would end up with a migraine after a 4hr drive. This has been my method ever since to get some noise, hear your motor, but not be droned out so much you hate driving your own truck. 

Share this post


Link to post
Share on other sites

Who's got the best price on the GM exhaust?  

Share this post


Link to post
Share on other sites
1 hour ago, bshort said:

Who's got the best price on the GM exhaust?  

When I bought mine it was shop Chevy parts dot com

Share this post


Link to post
Share on other sites
3 hours ago, mrcribbs said:

When I bought mine it was shop Chevy parts dot com

Yup. They have a 5% off promo code at the bottom on the site too. Shipping is the only wild card. It was very reasonable for me but if you’re far away it may wind up costing more than ordering at the dealer and having it sent to them.

Share this post


Link to post
Share on other sites

Just noticed the little silver "performance" badge mixed in with the paperwork that comes with the performance package.  Anyone stick this on their truck?  I'm curious where you put it.  I won't be using mine, it has a Chevy Logo on it, I've got an AT4 :cool:

Share this post


Link to post
Share on other sites

Test drove an AT4 yesterday with a 6.2 and performance package. Just barely louder than my current 2010 with a 6.2, 3.73 gears, stock exhaust, and K&N CAI. Couldn’t notice sound at all unless I punched it a little. It did seem a little more responsive to the throttle than mine. I went ahead and put my order in!

Share this post


Link to post
Share on other sites

Yup, really hard to tell while driving normal, but lets you know at heavy throttle, love it.

Share this post


Link to post
Share on other sites

Just got my GM exhaust on yesterday.  Nice! 

Share this post


Link to post
Share on other sites

Am I being picky or should this tailpipe be more inside the tip? 

1F462F17-5C5B-42E4-B34B-789E4866A968.jpeg

E6CE2F46-52DF-4E92-8C46-384F6FE9855C.jpeg

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.