Hi-Flow But Quiet Muffler
Thread Starter
Lead Lap
Joined: Oct 2001
Posts: 523
Likes: 0
From: Alabama
Hi-Flow But Quiet Muffler
Hello Gang,
I am doing a TT project for my 90 LS400. Since my down pipes are 3", i would like to upgrade the look and the flow of OEM mufflers. I would like to maintaint the quiet sound of a LS, but higher exhaust flow.
I have two Magnaflow mufflers along with Bassini X-Pipe on my 98 supercharged Cobra. Its loud and its ok for the mustang, but not for LS400
I am looking for quite but yet high flow muffler.
I am doing a TT project for my 90 LS400. Since my down pipes are 3", i would like to upgrade the look and the flow of OEM mufflers. I would like to maintaint the quiet sound of a LS, but higher exhaust flow.
I have two Magnaflow mufflers along with Bassini X-Pipe on my 98 supercharged Cobra. Its loud and its ok for the mustang, but not for LS400
I am looking for quite but yet high flow muffler.
Lexus Test Driver
Joined: Mar 2001
Posts: 824
Likes: 1
From: Texas
Yea, Magnaflow is pretty loud.
For a universal exhaust that isn't too loud check out Greddy or HKS because my experience with those exhaust are that they aren't loud till you stomp on it.
I don't know about the Apex but some are quiet from what i have heard.
For a universal exhaust that isn't too loud check out Greddy or HKS because my experience with those exhaust are that they aren't loud till you stomp on it.
I don't know about the Apex but some are quiet from what i have heard.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
What do you expect your power to be? With 2 banks of 2 liters each your output could range from 300hp to 1000hp with the most likely range of 400-500hp.
The larger the pipe diameter the harder it is to control the decibel level. Turbos actually muffle the exhaust somewhat. I had a 2.3 liter turbo with a 3" downpipe, 3" catalyst, 2.5" inlet to dual 2.25" Y-pipe leading to dual 2.25" tailpipes. Notice I had a turbo and catalyst but NO mufflers! The car was GT Mustang loud. Not quiet but not bothersome. BUT not Lexus...
As you may have noticed I am planning a complete cat back system for my 99 LS400. Most aftermarket Lexus exhaust is rear mufflers only. I have completely removed those and the sound level is still very low. Lou had his stock system break off after the center resonator and was quite loud. I am giving serious thought to a dual path system with a "power" valve. This system would use a high flow Y-pipe from the catalysts, have a large capacity center resonator and then have a unequal Y splitter. One side of the splitter would be 2" and lead to a resonator and then one stock final muffler. This would be the low speed path and would stay Lexus quiet. The other side would be 2.5" and would go straight to a very high flow muffler. This would be the power side. The "power" valve would be a butterfly valve closing off the power side below 4000rpm and would be operated with a solenoid.
Maybe a similar setup using a 2.5" quiet side and 3" power side would deliver on your plan?
The larger the pipe diameter the harder it is to control the decibel level. Turbos actually muffle the exhaust somewhat. I had a 2.3 liter turbo with a 3" downpipe, 3" catalyst, 2.5" inlet to dual 2.25" Y-pipe leading to dual 2.25" tailpipes. Notice I had a turbo and catalyst but NO mufflers! The car was GT Mustang loud. Not quiet but not bothersome. BUT not Lexus...
As you may have noticed I am planning a complete cat back system for my 99 LS400. Most aftermarket Lexus exhaust is rear mufflers only. I have completely removed those and the sound level is still very low. Lou had his stock system break off after the center resonator and was quite loud. I am giving serious thought to a dual path system with a "power" valve. This system would use a high flow Y-pipe from the catalysts, have a large capacity center resonator and then have a unequal Y splitter. One side of the splitter would be 2" and lead to a resonator and then one stock final muffler. This would be the low speed path and would stay Lexus quiet. The other side would be 2.5" and would go straight to a very high flow muffler. This would be the power side. The "power" valve would be a butterfly valve closing off the power side below 4000rpm and would be operated with a solenoid.
Maybe a similar setup using a 2.5" quiet side and 3" power side would deliver on your plan?
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maxgee
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