[Camaro10ss1]

I currently have a secondary cat delete and was thinking about deleting the npp mufflers for a straight pipe setup.
From what I keep reading most of the sound suppression comes from the factory cats. I'm not quite ready to void my warranty installing long tube headers,but was wondering if this setup would make my car not sound like a prius lol

[Peelam]

I can tell you from what mine does. It sounds OK but not really good, raspy and very loud(wake the neighbors loud, drone at hwy speed, 80 MPH is annoying). Bought my 16 1SS used and the previous owner had the secondary cats and mufflers removed and had pipe welded in. I'm going to change it to the AWE Touring Cat-Back in a couple months. It's Standard Exhaust not NPP but you get the idea.



Not so good video of the sound.
https://drive.google.com/open?id=1GH...YEk7jBvq2dA06I

[Camaro10ss1]

Originally Posted by Peelam

I can tell you from what mine does. It sounds OK but not really good, raspy and very loud(wake the neighbors loud, drone at hwy speed, 80 MPH is annoying). Bought my 16 1SS used and the previous owner had the secondary cats and mufflers removed and had pipe welded in. I'm going to change it to the AWE Touring Cat-Back in a couple months. It's Standard Exhaust not NPP but you get the idea.



Not so good video of the sound.
https://drive.google.com/open?id=1GH...YEk7jBvq2dA06I

Call me crazy but that sounds good to me lol. I bet it pops alot under deceleration?

[JeromeS13]

The NPP muffler practically IS a straight pipe when the valves are open. So there shouldn't be a dramatic difference in sound level.

[Peelam]

Originally Posted by Camaro10ss1

Call me crazy but that sounds good to me lol. I bet it pops alot under deceleration?

Yes it does crackle and pop a lot, which is OK. I just want to tone it down a bit since its my DD and I drive it on the freeway a lot.

[Camaro10ss1]

Originally Posted by JeromeS13

The NPP muffler practically IS a straight pipe when the valves are open. So there shouldn't be a dramatic difference in sound level.

I've heard that as well. I haven't had the chance to hear one with the npp and one without.

Originally Posted by Peelam

Yes it does crackle and pop a lot, which is OK. I just want to tone it down a bit since its my DD and I drive it on the freeway a lot.

If it crackles and pops alot that must mean there is alot of restriction in the factory muffler. I totally understand it being your daily not want it being too loud. I use to have a 5th gen that had long tube headers no cats and straight pipe all the way back Lol. It was raspy and very loud.

[MAGAUSA]

Originally Posted by Peelam

I can tell you from what mine does. It sounds OK but not really good, raspy and very loud(wake the neighbors loud, drone at hwy speed, 80 MPH is annoying). Bought my 16 1SS used and the previous owner had the secondary cats and mufflers removed and had pipe welded in. I'm going to change it to the AWE Touring Cat-Back in a couple months. It's Standard Exhaust not NPP but you get the idea.



Not so good video of the sound.
https://drive.google.com/open?id=1GH...YEk7jBvq2dA06I

Is that your Dad starting the car in his Birkenstocks?

[Peelam]

Originally Posted by MAGAUSA

Is that your Dad starting the car in his Birkenstocks?

LOL no that's me, had just detailed it before I shot that video.

[MAGAUSA]

Originally Posted by Peelam

LOL no that's me, had just detailed it before I shot that video.

Glad you have a sense of humor. My wife would never recover if I wore those.

[Spartan268]

Originally Posted by Camaro10ss1

I currently have a secondary cat delete and was thinking about deleting the npp mufflers for a straight pipe setup.
From what I keep reading most of the sound suppression comes from the factory cats. I'm not quite ready to void my warranty installing long tube headers,but was wondering if this setup would make my car not sound like a prius lol

It would make a slight different. I think the real kicker is it's more louder through-out the rev range from 500RPM onwards vs NPP where it's only loud when you step on it. I asked my fiance after I straight piped my NPP (Retained valves) and she said she can hear the difference from the outside.





I would suggest pulling the fuse first and see if that makes any difference. It may achieve the extra oomph desired. Otherwise if you're set on a higher volume I would recommend MBRP which is a 3 In. droneless straight pipe setup. Since it's 2.75 -> 3 In diameter you'll hear the difference. The helmholtz resonator eliminates the drone and it's fairly inexpensive versus other exhaust options.

[Camaro10ss1]

Originally Posted by Spartan268

It would make a slight different. I think the real kicker is it's more louder through-out the rev range from 500RPM onwards vs NPP where it's only loud when you step on it. I asked my fiance after I straight piped my NPP (Retained valves) and she said she can hear the difference from the outside.





I would suggest pulling the fuse first and see if that makes any difference. It may achieve the extra oomph desired. Otherwise if you're set on a higher volume I would recommend MBRP which is a 3 In. droneless straight pipe setup. Since it's 2.75 -> 3 In diameter you'll hear the difference. The helmholtz resonator eliminates the drone and it's fairly inexpensive versus other exhaust options.

Its funny you mentioned that. I actually pulled the fuse and its still really quiet to me. Do you think its a big difference in sound between a mbrp setup vs a straight piped setup minus drone?


It really seems like long tube headers are my only option if I want really loud lol

[AdmAnt13]

I just did Borla’s 60606 secondary cat delete and the Atak axle back. If you want loud with no drone, and retain stealth mode (to a certain extent) I’d try this setup. It’s LOUD.

A little pricey (I had a hookup) but well worth it.

[Camaro10ss1]

Originally Posted by AdmAnt13

I just did Borla’s 60606 secondary cat delete and the Atak axle back. If you want loud with no drone, and retain stealth mode (to a certain extent) I’d try this setup. It’s LOUD.

A little pricey (I had a hookup) but well worth it.

Not having stealth mode is totally fine with me. Its a weekend car for me. I always wanted borla atak even when I had my 5th gen. I just felt like a muffler delete would definitely be louder