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Exhaust with no drone?

campbell45

By campbell45
in Engines & Drivetrain

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surebuttercringe Enthusiast

surebuttercringe

Posted
Posted

Hey all, new member here but been following the forum since I bought my truck in Sept of 2014. I bought the Dynomax VT cat back after reading some of you guys talk about it and was hoping for the best but it hasn't turned out that well. Got it shipped in 3 days and when I opened up the muffler box I could hear a rattle. Called dynomax up and they sent out a new one under warranty but took over a week to get to me. Finally got my old exhaust off and the dynomax put on last night. The first problem I had was with the SS tip they sent. It was way to big to fit on the pipe and even with the clamp tightened as far as it would go I could still just pull it off the exhaust pipe. I was also not to impressed with the sound at idle but I do come from my last two Silverados having flowmasters on them. I finally took the truck for a spin today and I was actually pretty impressed with the sound under throttle and how quiet it got out of throttle. The downside is when my truck is in V4 and the throttle is lightly applied, starts to drone and the truck actually shakes a little but goes away as soon as it goes into V8. I am going to give it a few days but I may end up sending it back and putting my stocker on. Just hard to ride around in a quiet truck after 17 years of having some kind of exhaust on my previous trucks.

 

Sounds like you got a bum system all the way around. My Dynomax VT system has none of the issues that you speak of. I will say though, I had the exhaust shop tack weld my tip onto the pipe as well as the clamp so maybe that's why I don't have any issues. It is definitely a quiet exhaust and much quieter than Flowmasters, but again that's exactly what I was looking for. I've never had the shake in V4 mode so that's definitely odd. Good thing is that Dynomax has a 90 day guarantee, so if you end up not liking it, just send it back.

tnchevy Senior Enthusiast

tnchevy

Posted
Posted

I went out and drove the truck some more last night and it still did the V4 drone and slight shake but only when I was giving the truck just a little bit of gas. If you give it more gas in V4 (and it stays in V4) it would go away and also when it goes into V8. Most of my driving it is no big deal but really shows itself when cruise is set and going 55 down a flat highway where the truck stays in V4. This could be more of a characteristic of my truck that others may not run into, who knows. The system does sound pretty good though and if it wasn't for the V4 problem I would probably keep it but I think I am going to send it back. I will probably wait till the warranty runs out and then disable V4 and go back to a flowmaster 50 series setup.

tnchevy Senior Enthusiast

tnchevy

Posted
Posted

I had the same issue with the tip. I took out my air tools and tightened it all the way down after I used a dead blow hammer to close the relief cuts in the SS tip.

I am glad to hear I was not the only one with this problem. Took me maybe 30 mins to put the exhaust on but I spent 1.5 hours trying to get the stupid tip on.

tnchevy Senior Enthusiast

tnchevy

Posted
Posted

Called up the good people at Dynomax and they are going to take the exhaust back and refund my purchase price. I don't have much time to chase what is causing the V4 drone/shake but since I am taking a long weekend form work I will get the VT off and my stocker put back on. I dread putting that heavy thing back on and dread even more the sound of silence! I have heard those aftermarket air intakes can give a truck some growel so I may try on of those down the road. At least this finally got me off my butt to sign up on this forum. I had a 2002 Silverado for 12 years and got to know that truck pretty good so I will probably frequent that section of the forum some.

  • 2 weeks later...
  • 2 months later...
Sierra Jon Enthusiast

Sierra Jon

Posted
Posted

+1 Dynomax. It's a little more tamed than i was thinking it would be but ill take it for how quiet it is in v4

The DynoMax I had on my 2009 2500 was ridiculously loud. I'll have to dig up the model number. It was a straight muffler swap.

 

Any more reports on an 18" magnaflow muffler swap?

 

Sent from my Nexus 6 using Tapatalk

Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

My Dynomax VT catback is just too quiet for me. I love how the catback is configured though, makes it easy to swap out for a different muffler.

 

So, I just ordered a Flowmaster Super 40 (Center In / Offset Out (Same setup as the Dynomax VT)) Part Number 953047. Since the Flowmaster is a 13" case (19" overall) and the Dynomax is a 20" case (25" overall), I order a Flowmaster Slip Connection 3" in/out, that is 10" long. Part Number SF300. I'll have to trim 3-4" off it for it to fit properly.

 

Can't wait to try this out and see how it sounds. If it's too loud or drones, I have a Magnaflow 11229 (14" Case, 20" overall) sitting around that I'll try out, since Luster likes his 14" Magnaflow.

 

Luster, which part number do you have?

  • 2 months later...
GPGuy Senior Enthusiast

GPGuy

Posted
Posted

My Dynomax VT catback is just too quiet for me. I love how the catback is configured though, makes it easy to swap out for a different muffler.

 

So, I just ordered a Flowmaster Super 40 (Center In / Offset Out (Same setup as the Dynomax VT)) Part Number 953047. Since the Flowmaster is a 13" case (19" overall) and the Dynomax is a 20" case (25" overall), I order a Flowmaster Slip Connection 3" in/out, that is 10" long. Part Number SF300. I'll have to trim 3-4" off it for it to fit properly.

 

Can't wait to try this out and see how it sounds. If it's too loud or drones, I have a Magnaflow 11229 (14" Case, 20" overall) sitting around that I'll try out, since Luster likes his 14" Magnaflow.

 

Luster, which part number do you have?

I don't know if it's the same one as him but 11229 is the part number on the 14" magnflow I was looking at today.

Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

I don't know if it's the same one as him but 11229 is the part number on the 14" magnflow I was looking at today.

Yup, that's a great muffler.

 

I'm happy with my flowmaster super 40 too.

 

Sent from Tapatalk App - Samsung S6

GPGuy Senior Enthusiast

GPGuy

Posted
Posted

Yup, that's a great muffler.

 

I'm happy with my flowmaster super 40 too.

 

Sent from Tapatalk App - Samsung S6

Awesome! Thanks for the input!

  • 4 weeks later...
Cohen Enthusiast

Cohen

Posted
Posted

I don't know if it's the same one as him but 11229 is the part number on the 14" magnflow I was looking at today.

 

 

Yup, that's a great muffler.

 

I'm happy with my flowmaster super 40 too.

 

Sent from Tapatalk App - Samsung S6

 

 

Have you checked out the 12866? Looks like its similar dimensions but 2.5".

GPGuy Senior Enthusiast

GPGuy

Posted
Posted

 

 

 

 

Have you checked out the 12866? Looks like its similar dimensions but 2.5".

Thanks for the suggestion :thumbs: but I went with the 14" I mentioned above...as soon as I get some good weather on a day that I have free time I will be doing an after video, since I have already done the before.

  • 2 weeks later...
6D9 Matt Enthusiast

6D9 Matt

Posted
Posted

I don't know if it's the same one as him but 11229 is the part number on the 14" magnflow I was looking at today.

 

The 14" MF was my plan as well, although I noticed I had written down part # 12229 rather than # 11229. I looked it up and here is the difference:

 

12229 - offset inlet, center outlet

11229 - center inlet, offset outlet

 

So which is better fitment for my application? I have a '15 6.2 Denali.

GPGuy Senior Enthusiast

GPGuy

Posted
Posted

 

The 14" MF was my plan as well, although I noticed I had written down part # 12229 rather than # 11229. I looked it up and here is the difference:

 

12229 - offset inlet, center outlet

11229 - center inlet, offset outlet

 

So which is better fitment for my application? I have a '15 6.2 Denali.

Not sure how the 6.2L is...I would suggest calling a local muffler shop or post up a thread here specifically asking that question.

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