2014+ Exhaust Systems & Mufflers

[tim s]

The header part number is gp137s-c you can find them on eBay brand new and I just made an offer of $500 and they shipped them to me at that price. i recommend getting some different bolt like stage 8 or ARP for them but they are fairly easy to install only took me 2 hours partly because my phone wouldn't stop ringing

[iicoolbreeze]

Got a killer deal on a MBRP stainless cat back kit 3.5": installed with a black MBRP tip out the door was $400.

[Mike1220]

whats the main difference between long tube vs short tube headers? Will one give better performance gains or louder sound than the other?

[SouthernSilveradoGuy85]

whats the main difference between long tube vs short tube headers? Will one give better performance gains or louder sound than the other?

 

Long tube I believe will give better performance, but you'll have to mod the exhaust to fit them. Most people seem to get shortys because they're a direct replacement with no other mods. As for sound I'm really not sure. I don't know if I ever will but if I get headers they will just be shortys so I don't have to mod anything. Most headers for trucks seem to be shortys, especially 4x4s it seems. Someone knows more about it than I do though.

[DanMan_S]

 

Long tube I believe will give better performance, but you'll have to mod the exhaust to fit them. Most people seem to get shortys because they're a direct replacement with no other mods. As for sound I'm really not sure. I don't know if I ever will but if I get headers they will just be shortys so I don't have to mod anything. Most headers for trucks seem to be shortys, especially 4x4s it seems. Someone knows more about it than I do though.

 

Mod the exhaust? What do you mean by that?

 

I've never had to mod the exhaust on any of my vehicles that I've put long tube headers on. Pretty much every kit on the market is a direct replacement for your exhaust manifolds, catalytic converters and Y pipe. Heck, on the trucks you could easily do the headers in afternoon if you have the tools available and a lift to help. Every kit I've used will bolt right up to your factory exhaust. All of the aftermarket companies I've dealt with offer full long tube kits for the trucks; stainless works, american racing, kooks, etc, etc.

Edited February 9, 2015 by DanMan_S

[DanMan_S]

whats the main difference between long tube vs short tube headers? Will one give better performance gains or louder sound than the other?

 

The benefit of the headers is the length of the primary tubes to assist with exhaust gas scavenging. The longer they are, the more torque/power you'll make. Shorty's will pretty much be a replacement for your exhaust manifolds only, while long tubes will replace the manifolds, downpipes and your catalytic converters. I've never done a set of Shorty's before, but I'd assume they'd be abit easier to install; although any of the times I've done my headers, the hardest flange to break apart was the exhaust manifold outlet itself as it's in a very difficult place to be able to reach all of the bolts. With the long tubes, I've found the easiest method is you unbolt the factory manifolds at the engine, then cut the pipes on the underside so the manifolds drop out, then just undo the rest of the piping.

Edited February 9, 2015 by DanMan_S

[tim s]

You don't have to do any mods to the exhaust with long tubes but you do run into the problem with the check engine light coming on because the O2 sensors are programmed to see the exhaust gas at a certain temp and the long tubes have to move the O2 sensors down stream so the gasses are colder than expected but a tune shop can fix it pretty easily... Long tubes give a much greater gain on power and torque but shorty give gains over stock manifolds due to better scavenging. If price is a factor shorty headers are alot cheaper $500-$700 for shorty vs. ~$1600 for long tube

[txchevy4ever]

Well, I think I screwed up on my 2015 LTZ Z71 5.3 with my new exhaust system. Don't get me wrong, it sounds amazing, and the workmanship my guy did was awesome, but I'm afraid my 18" magnaflow (single in dual out) is way too loud, especially under acceleration at low speeds.

 

My wife is not happy, and honestly it is probably too loud. I just got the work done on Monday 2/11, but I feel like I'm going to have to do something fairly quickly to quiet it down. I'm wondering how much % of a difference a 22 or 24 inch would make, or if I need to go back to a stockish muffler. Any suggestions are appreciated.

[Luster]

Well, I think I screwed up on my 2015 LTZ Z71 5.3 with my new exhaust system. Don't get me wrong, it sounds amazing, and the workmanship my guy did was awesome, but I'm afraid my 18" magnaflow (single in dual out) is way too loud, especially under acceleration at low speeds.

 

My wife is not happy, and honestly it is probably too loud. I just got the work done on Monday 2/11, but I feel like I'm going to have to do something fairly quickly to quiet it down. I'm wondering how much % of a difference a 22 or 24 inch would make, or if I need to go back to a stockish muffler. Any suggestions are appreciated.

 

I took my truck with the 22" Magnaflow back to the exhaust shop and told him it sounded like a Prius. I couldn't hear the exhaust sound at all.

 

Just barely louder than the factory exhaust.

 

You said your Magnaflow was 18". Are you meaning the overall length including the inlet/outlet pipes? If so, it's a 14", which is pretty loud. That's what I switched to. The length of the casing is normally how the muffler is measured.

Edited February 11, 2015 by Luster

[txchevy4ever]

Thanks for the feedback. My length of the casing is 18" and it seems deafening under acceleration (near silent at 70 mph cruise).

 

I'll take some video with audio and post...

Edited February 11, 2015 by txchevy4ever

[Luster]

Thanks for the feedback. My length of the casing is 18" and it seems deafening under acceleration (near silent at 70 mph cruise).

 

I'll take some video with audio and post...

 

Did they remove the "flapper" valve and the resonator? That will make the truck quite a bit louder also. They are there to help eliminate drone.

[txchevy4ever]

 

Did they remove the "flapper" valve and the resonator? That will make the truck quite a bit louder also. They are there to help eliminate drone.

 

Yep, that's probably my mistake, I had them remove the flapper, the resonator and the 3rd cat.

[Luster]

 

Yep, that's probably my mistake, I had them remove the flapper, the resonator and the 3rd cat.

Call your exhaust shop and see if they still have that pipe with the valve and resonator. They can put it back on and probably fix the problem without changing mufflers. Third cat, I don't know how much that muffles the sound, but probably some.

[txchevy4ever]

Call your exhaust shop and see if they still have that pipe with the valve and resonator. They can put it back on and probably fix the problem without changing mufflers. Third cat, I don't know how much that muffles the sound, but probably some.

Thank you for the advice and I will give that a try.

[fataslp]

I took off the flapper resonator and tailpipe and replaced it with 3" out and a dual corsa clone. I love it now. I am using the gmpp muffler for the nnbs trucks.