[2023-SS]

wife LOVES how the car sounds stock with the NPP set to "TRACK", which is basically the same as pulling the NPP fuse (#71?), I usually drive in TRACK MODE to make it bark more.

I want to put Long Tube headers on (jet hot coated) and maybe no CATs (less heat since we are in SC, and less cost of exhaust plumbing?).

most threads say Longtubes are zero gain over stock manifolds until over ZL1 power levels, so not really worth it in my case as a DD & weekend fun car. just something I want.

ZL1 guys established in another thread (https://www.camaro6.com/forums/showthread.php?t=637088) quality headers can be zero maintenance, and last forever. but they can be LOUD.

how loud would Long tubes be with no CAT, with the stock Suitcase and the NPP shut, in STEALTH mode.

we have a small one car garage, and a remote start is LOUD with the NPP open, and sometimes it smells bad if you leave it idling too long. so even if I remote start it, I have to open the garage door (have a remote inside house) and then prop open the back door, to keep the smell out of the house.

will the remote start stench get worse without cats?
I read some guys are running E85 to minimize Stinky Starts.

in other words, STEALTH mode as a daily driver,
NPP be "automatic" for fun driving,
NPP in "track" mode when being an "annoying butthole"
(my wife's assessment of me making the pipes rattle)

[AZIROC]

LTs usually still make some power, even on a stock motor.

As far as sound, Lts (with or without cats) into the suitcase sounds pretty good. No cats just makes it alittle louder. If you are doing LTs and need to do a tube anyway, along with its not an issue deleting the cats, id say go ahead and do it at the same time.


Yes, you will get a wiff of the exhaust/gas smell with no cats. You will notice it if you sit at a red-light for a while (with the windows down) or if you let the car warm up in an enclosed garage. Its not eye burning, but you will notice it.

[Knightfall50th]

Just FYI, you need to open the garage door when you crank any car.

[arpad_m]

Originally Posted by 2023-SS

wife LOVES how the car sounds stock with the NPP set to "TRACK", which is basically the same as pulling the NPP fuse (#71?), I usually drive in TRACK MODE to make it bark more.

I want to put Long Tube headers on (jet hot coated) and maybe no CATs (less heat since we are in SC, and less cost of exhaust plumbing?).

most threads say Longtubes are zero gain over stock manifolds until over ZL1 power levels, so not really worth it in my case as a DD & weekend fun car. just something I want.

ZL1 guys established in another thread (https://www.camaro6.com/forums/showthread.php?t=637088) quality headers can be zero maintenance, and last forever. but they can be LOUD.

how loud would Long tubes be with no CAT, with the stock Suitcase and the NPP shut, in STEALTH mode.

we have a small one car garage, and a remote start is LOUD with the NPP open, and sometimes it smells bad if you leave it idling too long. so even if I remote start it, I have to open the garage door (have a remote inside house) and then prop open the back door, to keep the smell out of the house.

will the remote start stench get worse without cats?
I read some guys are running E85 to minimize Stinky Starts.

in other words, STEALTH mode as a daily driver,
NPP be "automatic" for fun driving,
NPP in "track" mode when being an "annoying butthole"
(my wife's assessment of me making the pipes rattle)

I have Jet Hot coated Kooks long tube headers WITH primary (green) cats into the stock NPP muffler, and cold starts in the garage are freaking loud. WIth no cats, they will literally rock your house, and you will always be "that guy" even if your county doesn't prohibit catless rides.

Engine sound in the interior is actually super pleasant with my setup, and WOT pulls sound appropriately brutal, especially with the bam-bam fuel cut shifts on the A8.

Also, these headers are noisier (tickier) and intensify the brutal midrange "whip" rasp a bit, just so you know what to expect. A properly designed axleback such as the Borla S-Type can take that edge off, or maybe a pair of resonators, too.

Ethanol does help a lot with the stink (although I love the smell of gas, heh, but it may not be for everyone).

[AZIROC]

Originally Posted by Knightfall50th

Just FYI, you need to open the garage door when you crank any car.

Why cant you start a car with the garage door close? The immense pressure from the exhaust going to blow the garage door off the hinges?


Id just suggest not starting the car and hanging out for the next 30 mins with the door closed.

[2023-SS]

Originally Posted by arpad_m

I have Jet Hot coated Kooks long tube headers WITH primary (green) cats into the stock NPP muffler, and cold starts in the garage are freaking loud. With no cats, they will literally rock your house, and you will always be "that guy" even if your county doesn't prohibit catless rides.

Engine sound in the interior is actually super pleasant with my setup, and WOT pulls sound appropriately brutal, especially with the bam-bam fuel cut shifts on the A8.

Also, these headers are noisier (tickier) and intensify the brutal midrange "whip" rasp a bit, just so you know what to expect. A properly designed axleback such as the Borla S-Type can take that edge off, or maybe a pair of resonators, too.

Ethanol does help a lot with the stink (although I love the smell of gas, heh, but it may not be for everyone).

that's pretty much the feedback I was looking for: It might be crazy loud on startup...and have some rasp at other RPM.

I think I better leave it alone...


we can remote start our little Japanese cars with just the single big garage door open (eazy peezy: hit the car remote, then hit the garage remote),
and neither of them stink stank stunk.

but that 6.2 on cold idle REQUIRES you to open the big garage door in the front, and the walk out door in the back, so it has wind blowing thru, otherwise, it comes into the living room.