01-03-2012, 06:59 PM | #1 |
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LTs and Cats - A Quiet system
Lately I have seen a few posts here about having long tubes with a semi-quiet exhaust system. So i want to share my experience with my LS3 and a similar quest.
Some of us like to hear our motors but in a subdued way. While we like speed we also want to take our cars on long trips with our families and be able to listen to and enjoy music and books on tape. And there is a special kind of fun in having a fast car that doesn't sound fast or attract attention. My car is an LS3 and i was looking to add long tubes and high flow cats while avoiding a loud exhaust and hopefully not spending a lot of money. For starters I found a great deal on a set of used 1 7/8 Bigflow stainless LTs with a pair of high flow cats. I installed these myself in my garage. I started out by keeping the stock catback. I was hoping that this combination would keep things quiet while spending the least dollars. One strange thing about the BFE cats is they are longer than most and require you to cut your stock sized cutback to install. But since I would only be cutting the stock pipes, I did not see this as a problem. My results with the LTs and stock cutback: The Good -
I did not want to buy an expensive cat back and then cut it to install. So I looked around and decided to install one of the quieter axle-backs, the Magnaflow Street. This seem to be ideal. It would keep the car quiet, while saving some weight replacing the huge stock muffler cans. My results with the Magnaflow axle-back: The Good -
I put up a post talking about the drone and a vendor suggested I try the Magnaflow X-Pipe. This pipe (which looks like a muffler) replaces the stock LS3 H pipe and is also part of the Street Series cutback. So I bought the pipe and had it installed in a local muffler shop today. It replaces the stock H-pipe and leaves the stock LS3 resonators. While they were at it they fixed a couple of exhaust leaks and let me know one of my sway bar brackets fell off. They also moved things around to give me a little more clearance over the rear tunnel cross brace. My results with the X-pipe: The good -
For anyone looking for a quiet LT set up I can recommend LTs with the Magnaflow Street Series products. With the X-Pipe install cost I ended up spending almost as much as a full cat-back. If i were to do it over I would probably just buy the Street series cat-back and then cut it to fit the BFE cats. However then I would lose the LS3 resonators which may be the things that makes my setup work for me. Then again they may be contributing to the drone. Anyone try LTs with the Magnaflow Street cat-back? I suppose there are other quiet LT solutions that work s well as Magnaflow Street.
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01-03-2012, 07:19 PM | #2 |
by Odeon
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Honestly, you're going to find yourself SOL trying to find a quiet solution. LT's are going to be loud with the majority of aftermarket systems, if not all.
I think the only hope of getting the sound level you want is through the stock cat back.
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01-03-2012, 07:20 PM | #3 |
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No slap here?
Tell me more about this wide open & annoying "slapping" sound......because, I don't have or hear it with stock exhaust??? Was your exhaust loose from the header install?
Also don't have loud de-accel popping either?
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01-03-2012, 08:07 PM | #4 | ||
Original Bumblebee Owner
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Great post. Lots of good info
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01-03-2012, 09:07 PM | #5 | |
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Quote:
The stock cat-back seemed louder to me at high RPM than my current setup. But loud is not really the problem, it is the drone.
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01-03-2012, 09:20 PM | #6 | |
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Quote:
Perhaps your tuner has tuned out the de-accel popping. They often do that as many owners do not like the sound. But I will leave mine alone as it helps gas mileage.
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01-03-2012, 10:29 PM | #7 |
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Yeah....should've bought the 3" Magnaflow Comp exhaust. Nice deep rumble at start up, nice and reasonably quiet at low speeds (almost too quiet), but get on it and you'll definately know it. My decel popping is virtually gone. It's still there a little if you listen for it but barely.
You would be surprised at how inexpensive the 3" Magnaflow is from the right vendor. LTs, HF cats, and the 3" Magnaflow is a great steet setup. Especially if you don't want to piss off the neighbors or draw a bunch of attention from the cops.
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01-05-2012, 10:03 PM | #8 | |
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Quote:
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01-05-2012, 10:18 PM | #9 |
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J PIPES!! ENOUGH SAID WILL CALM ANY SYSTEM!
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01-06-2012, 08:56 AM | #10 | |
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Quote:
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01-06-2012, 10:23 AM | #11 |
My car runs on acorns....
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I have kooks 1 7/8, hi flo cats and kooks sleeper exhaust. I'm supercharged as well, it's surprising how quiet it is for my setup.
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01-06-2012, 10:07 PM | #12 |
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Nice! I think it is fun to have a quiet, fast car. Extra awesome with FI.
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01-06-2012, 10:10 PM | #13 |
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This is what I built the hard way. One difference is I also have the LS3 resonators. Not sure how this affects the sound. Did your Magnafow stay at the same sound level over time? I
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01-07-2012, 07:05 AM | #14 |
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I have Kooks 1 7/8 catted with the Magnaflow Street Series and until it was cammed, it was very quiet. Even with the cam, I get the lopey idle sound, but the exhaust is not deafening.
I have heard the Kooks Street Sleeper is even quieter. Videos here with the cam: http://www.camaro5.com/forums/showthread.php?t=165686
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