Muffler Delete

[KARNUT]

I have an exhaust guy I been using for 30 years. Most times Ill have him put a y pipe just after the cats, run 3 inch strait along side of the stock exhaust make both tips exit just above the bumper. Put an header flange on the loud side to cap and uncap, best of both worlds. I got the idea from my drag racing days.

[KUUG]

I have an exhaust guy I been using for 30 years. Most times Ill have him put a y pipe just after the cats, run 3 inch strait along side of the stock exhaust make both tips exit just above the bumper. Put an header flange on the loud side to cap and uncap, best of both worlds. I got the idea from my drag racing days.

 

Not a bad idea I've always just looked at those cut offs to be just for really loud but I'm liking the idea of this. Do you have any pictures of the exit(tips)?

[KARNUT]

I don't have it on current truck yet, He would get collector flanges put turn downs just above the bumper weld on flange, make a plate to cover the pipe 3 bolts and wing nuts. Im testing muffler delete now may stay with that.

[zactech]

Is there any loss or gain in power or loss or gain in fuel mileage? I was told by my dealer on my 2009 that it would change the flow and therefore change shifting and dump more fuel into the engine. Maybe bs but I did notice it shifted differently after I did it on my 2009.

[KARNUT]

Anytime you make the air come in or go out better, gas mileage goes up some. But, But, But did I say But, you going to test it more, did I say test, in the real word on a long hwy cruise the potential is there.

[20Sierra14]

Could anyone share the P/N for the 22in Magnaflow they're using?? I highly doubt any local shops here will have the correct one!

 

 

Edit: I'm looking for just the muffler only.. I'm not interested in an entire cat-back system.

 

 

Thanks!!!

[Btreyu09]

Should be the 12589. 3" in/out and center/offset

[20Sierra14]

Should be the 12589. 3" in/out and center/offset

 

 

Found it... bought it! Thanks!!

[jlchavezz1]

So did everybody that got the muffler delete done get that helicopter sound time after? I would greatly appreciate the response I'm about to get that done. If not I will think highly of getting magnaflow.

[KARNUT]

So did everybody that got the muffler delete done get that helicopter sound time after? I would greatly appreciate the response I'm about to get that done. If not I will think highly of getting magnaflow.

Most every exhaust mod brings the V4 sound, there is some debate on the dealer option exhaust which is costly. In my case muffler delete and Hypertech for around 400$ total which cured all my problems. Then of course the tune debate and warranty debate. I picked can tune for the backing if a warranty claim comes up, muffler delete sounds just fine and is cheap. Im not afraid to spend the money couldn't see the point. That's debated too.

[bdbake01]

So did everybody that got the muffler delete done get that helicopter sound time after? I would greatly appreciate the response I'm about to get that done. If not I will think highly of getting magnaflow.

 

Nope. Just keep the flapper in, no 'copters following me!

[Tankster2014]

I just did the muffler delete on my 2014 6.2L and couldn't be happier. Had the muffler replaced with 3 inch 409 stainless and left the flapper valve in. I currently have it clamped open with a band clamp as I have AFM shut off and a tune from Diablo. However if I decide to tune for economy the clamp can be removed in a second. Only other mod is a drop in AFE dry air filter. The sound is absolutely perfect. Nice deep rumble at idle and mild acceleration and a nice growl at WOT. Cabin is quiet as stock at highway speeds in OD. I have had numerous catback systems and this sounds as good as any especially for an 80 dollar mod. Saved 900 bucks which paid for my programmer and tonneau.

 

I could have had it done for half the price but I chose stainless and stainless welds so no rust and I am worry free. I doubt any catback will outflow this mod in any noticeable way. No drone at highway speeds in v4 when I take the clamp off the flapper either. Best of both worlds. Couldn't be happier.

 

Check out the vid. Warm start and revs to 4K.

[hutch08]

Planning on doing this to my 2015 Sierra 5.3L right away, I'm surprised how quiet they still are with the muffler removed. I guess the resonator does a pretty good job by itself!

[Back in a Bowtie]

this mod all good emissions wise for NY?

[hutch08]

Can't believe how "quiet" it still is with the muffler removed. Slightly louder at idle and actually sounds like a v8 now.
You probably wouldn't even notice a change if you weren't familiar with these trucks, my stock 08 Denali with the 6.2 was louder.
No drone on the highway in v8 or v4 mode, but I did leave the Adaptive Exhaust Valve in place.