Daily with Headers?

[JayAction]

Curious, how many of you guys run long tube headers and still use your vehicle as a daily?

I've got a GT500 with an aftermarket cat back on it already.

I was looking to add a pair of Kooks green catted long tube headers and a whipple to the car in the near future, however I'm worried that the headers will make the car too loud for daily driving

So just how loud is full exhaust, with cats but no resonators?

Is it too much to get away with on the daily without being harassed by police?

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[robvas]

It's pretty loud but if you have something with a muffler (and not a Corsa Extreme/Borla ATAK) it shouldn't be THAT loud. It won't be quiet by any means, though - especially at startup.

Also keep in mind even with the green cats my car stinks a little bit...not like no cats but it does have a smell to it.

 

[Andy13186]

You have to get a valved exhaust system like varex for cold starts to be reasonable without cats and probably even with green cats

 

[jpjr501]

Don't have a GT500 but I run Stainless Works Long Tubes, no cats, stock resonator into a stock cat back exhaust and it'still pretty loud. Has to be the Long Tubes making the noise. Well no cats either, that's a big one but I run a Procharger with E85 so not very cat friendly.

I had an aftermarket h-pipe and basically straight piped cat back exhaust which blew the pictures off my garage walls. The Long Tube header rasp with that exhaust system on cold start pissed a lot of neighbors off. Now that I changed it mostly back to stock, we're friends again.

My car makes 800HP and there is no need to be obnoxious, it's plenty fast.

 

[skinnyb]

Mine is just a GT with catted long tube's and a Borla S type active exhaust. I have mine start in quiet mode every time now, it's that loud. Only open the valves when I want to hear it.

 

[rolfe.oliver]

Curious, how many of you guys run long tube headers and still use your vehicle as a daily?

I've got a GT500 with an aftermarket cat back on it already.

I was looking to add a pair of Kooks green catted long tube headers and a whipple to the car in the near future, however I'm worried that the headers will make the car too loud for daily driving

So just how loud is full exhaust, with cats but no resonators?

Is it too much to get away with on the daily without being harassed by police?

If you are dallying a 2021 GT500 why would you put a WHipple on it? You can make 1,000+ with stock blower. Anyways, now to get off my soap box.

Just put the stock catback back on. GT500 has valves and sill sound great with FFE. Just know, the Kooks green cats melt, too.

 

[JayAction]

If you are dallying a 2021 GT500 why would you put a WHipple on it? You can make 1,000+ with stock blower. Anyways, now to get off my soap box.

Just put the stock catback back on. GT500 has valves and sill sound great with FFE. Just know, the Kooks green cats melt, too.

I was going to go whipple because I’ve seen the stock blower has heat issues when you do too much to it.

I’ve also heard the whipple can run 93 safely at higher Hp than the stock blower upgraded.

The green cats melt? Are you saying this is just something they do, or are you insinuating it be the case because of the hp this set up would put me at?

Are they not higher quality than the stock cats?

is this an issue with all cats?

 

[JayAction]

It's pretty loud but if you have something with a muffler (and not a Corsa Extreme/Borla ATAK) it shouldn't be THAT loud. It won't be quiet by any means, though - especially at startup.

Also keep in mind even with the green cats my car stinks a little bit...not like no cats but it does have a smell to it.

How noticeable is the smell?

Can a black ice tree cancel it out?

I’ve got Stainless Works Redline … welp

 

[rolfe.oliver]

I was going to go whipple because I’ve seen the stock blower has heat issues when you do too much to it.

I’ve also heard the whipple can run 93 safely at higher Hp than the stock blower upgraded.

The green cats melt? Are you saying this is just something they do, or are you insinuating it be the case because of the hp this set up would put me at?

Are they not higher quality than the stock cats?

is this an issue with all cats?

Upgraded heat exchanger with upgraded intercooler bricks should take care of any heat issues. Besides, how often are you WOT in a daily? I would highly recommend you NOT go Whipple, in your case.

Octane is octane. Even with the predator's lower compression verse the coyote/voodoo, there is a power limit on 93, regardless of the power adder. I would not put much money on that claim about more power on 93 stance "safely".

For the cats, all cats, except maybe GESI (to a point) will melt under high load with boost. GT500s are even more prone to dumping fuel and can fail cats. Best bet is to either delete cats, or pony up for expensive GESi cats.

Bottom line: GT500 trans cannot be tuned. You cannot use power at a certain level. If I were you, I would do free flowing exhaust, E85, intake, upgrade cooling and call it a day. 800whp is the sweet place on these are, in my opinion.

 

[Cordero1]

I don't have a GT500 but a measly GT & the sound that the Kooks puts out is very tolerable for dd. Now yours being boosted might be a bit louder, but definitely not loud enough to call the attention of the police by any means. Unless the LEO is a complete dick. I've had louder ricer cars

 

[GrayS550]

I have BBK LTH + full GT350 exhaust. Cold starts valves closed is a bit on the medium side of loudness but quiets down fast. Valves open - cold start is very very loud.


But for daily driving valves closed is pretty quiet.
Valves open daily driving is loud. Very loud! I drive with valves open in the city and highways, but valves closed in the neighborhood. Cops don’t touch me. WA doesn’t have an exhaust law.

This is valves closed

This is valves opened

 

[Sundyrse59]

Just for comparison. I have a '65 hi po 289cid. It has a set of old school hookers, and a pair of bombs that drop just behind the front seat. Inside, the drown is so loud, I wear earplugs. Outside it sounds sweet . I no longer use it as a Daily because of it. Change the sound, NO WAY IN HELL.
I only do shows and parades with it. As long as you can enjoy your RIDE, it will not be to loud. And to think 45 years ago, I enjoyed the drown without earplugs, as my Daily.

 

[SloppyTX]

I daily mine as long as the sun is out.

 

[Jose1962]

I don't have a GT500 but a measly GT & the sound that the Kooks puts out is very tolerable for dd. Now yours being boosted might be a bit louder, but definitely not loud enough to call the attention of the police by any means. Unless the LEO is a complete dick. I've had louder ricer cars

Agree I’m at 830whp boosted e 85 headers green cars borla s type I added vibrant resonator after x pipe only the quiet mode is not loud normal on up is loud and loud once you step into all modes 2020 gt

 

[Ramairetransam]

do the headers, do the cats and use the stock catback .

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