Headers do increase the sound quite a bit and catless will increase it even more. I have cats on both of my vehicles with headers because I want to keep the smell down. Are you anti-cat-back? I have a Corsa Touring on my Escalade and it is quieter than the stock cat-back. I will admit that wasn't exactly my goal but the Corsa Sport with the headers was pretty obnoxious (still absolutely no drone though).
Need it as quiet as possible without choking the flow
- Thread starter iamdub
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iamdub
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All on my list to investigate! Thank you.
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iamdub
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Glad I'm not the only one that considered this. The flow volume will certainly be there!
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iamdub
Full Access Member
I was aware of the thinner steel of the headers passing more sound, but accepted that in the name of horseytorques. The ones I have are ceramic coated three times internally and five coats externally. I really think they do a good job at suppressing the sound compared to other headers I've heard. Most of what I hear sounds like it's coming from the back. I like hearing my music as well and just a healthy growl when I'm on the throttle. It was perfect before deleting the cats.
After yours an 91RS's input, I'll look at the Corsa Touring (or it's clone cuz I'm cheap). Thank you.
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iamdub
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I'm only anti-cat-back in the sense of replacing pipe that is perfectly fine with expensive pipe when all that's functionally changed is the muffler. I just chop the stock muffler out of the stock piping and weld whatever muffler in it's place. That's two referrals to the Corsa Touring, so it's now on my radar. I never expected it to be quieter than stock. Interesting.
Thanks for the input!
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iamdub
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What I'm aiming for is to have a volume control on my exhaust. I have an electric cutout that has a valve in each outlet, oriented 90° from each other. When one is closed, the other is open and vice versa or anywhere in between. I want one outlet to go through a muffled circuit and the other through a straight pipe that bypasses the muffler then ties back in after the muffler to the pipe that arches over the axle. I'd have a muffled and unmuffled route that exits out the same tail pipe. I'd like to control it with the + and - rocker switch on a gear selector/shifter from an '09+.
I want to have a range of near-stock (or at least pre-cat-delete) volume to fully uncorked. As it is now, I'd just have "loud" to "obnoxiously loud".
Link with video of operation:
https://www.aliexpress.com/item/32846266927.html
I want to have a range of near-stock (or at least pre-cat-delete) volume to fully uncorked. As it is now, I'd just have "loud" to "obnoxiously loud".
Link with video of operation:
https://www.aliexpress.com/item/32846266927.html
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gooffeyguy
Tom
Have you looked into any high-flow cats?
avalonandl
Full Access Member
You need a 3 chamber muffler like the Flowmaster BB70 mufflers and a resonator to get rid of the drone since losing the cats has really opened it up.
Seriously the OEM muffler is not that bad. Its made by Walker.
Seriously the OEM muffler is not that bad. Its made by Walker.
maybe we need to think outside of the box here!
https://i.ytimg.com/vi/Qwg7YC1Un-4/maxresdefault.jpg
https://i.ytimg.com/vi/Qwg7YC1Un-4/maxresdefault.jpg
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iamdub
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I was actually really looking into the Walker 21577. Stainless turbo style and only $82. But that'd get me a stock-like muffler which may still be too loud without the cats. YouTube vids of stock exhaust but with cat delete sounded a bit loud, but you can only take so much stock in those vids.
Anyone know of any actual CFM numbers for the stock muffler?
