Greddy Revolution RS Catback - Lexus IS Forum
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post #1 of 6 (permalink) Old 06-17-2019, 07:31 PM Thread Starter
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Greddy Revolution RS Catback

I did a bunch of research on this system and finally bought it. I installed it and it's very loud and the drone is unbearable. Every review and video I've seen indicates this exhaust shouldn't be this loud with the stock manifold and y-pipe.

Does anyone else have this system? I'm thinking that I may have installed it incorrectly or I could have recieved a defective part, but I highly doubt that's the case.
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post #2 of 6 (permalink) Old 06-17-2019, 11:34 PM
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I also have this exhaust, it is extremely drone-y around 3000 rpm, I just figured it was how it was. I have gotten used to the drone, unfortunately the car rides at exactly 3000 rpm going 67 mph, my cruising speed on the highway :|

I also bought mine recently, so there's a chance it is some kind of defect in the batch. I would be interested to know if someone who bought one a while ago is also experiencing this.
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post #3 of 6 (permalink) Old 06-18-2019, 08:36 AM Thread Starter
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Yep, 3000 rpms unfortunately is within the range where I'm at most of the time. The volume or tone isn't that bad honestly, it's the drone that is deafening.

I stuck my phone in the muffler last night to see how the packing looked and it almost looks like there could be more?
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post #4 of 6 (permalink) Old 06-18-2019, 11:48 PM
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I'll get a pic of mine when I get home, I'm on vacation now but I am guessing it will look similar
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post #5 of 6 (permalink) Old 06-20-2019, 02:01 AM
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Quote:
Originally Posted by jmgillardi View Post
I also have this exhaust, it is extremely drone-y around 3000 rpm, I just figured it was how it was. I have gotten used to the drone, unfortunately the car rides at exactly 3000 rpm going 67 mph, my cruising speed on the highway :|

I also bought mine recently, so there's a chance it is some kind of defect in the batch. I would be interested to know if someone who bought one a while ago is also experiencing this.
Boy do I have a solution for you! If you're up to the task of course. Look up a helmholtz resonator. You can reduce the drone at a specific frequency by taking advantage of fluid mechanics.

Here's a good example on how to make one:
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post #6 of 6 (permalink) Old 06-22-2019, 01:07 AM Thread Starter
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Bought a 3" augar style muffler and wacked it in the muffler with a hammer and a block of wood. It definitely required some effort to get it in there, so I don't expect it to come out on it's own.

There's absolutely no drone and the overall volume has been reduced quite a bit. I'm loving the way it sounds now. Loud enough and very streetable. Removal will most likely require a slide hammer as it's pretty tight in there.

I'd recommend this for anyone wanting to quiet down their revolution rs exhaust!

http://www.amazon.com/dp/B019XE4ROI/..._GgDdDb8HEW9W2
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