will removing the rear mufflers increase performance? - Club Lexus Forums


will removing the rear mufflers increase performance?

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Old 05-12-11, 03:37 PM   #1
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Default will removing the rear mufflers increase performance?

will removing the rear mufflers increase performance?

I mean the ones at the very rear. Also, Is the exhaust on the gs400 similar to ls400?
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Old 05-12-11, 03:52 PM   #2
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Removing the rear mufflers will not increase performance from what i know of..
I Did remove the two rear Resonators on my 1991 LS400.

But what years are you talking about in the GS to LS Comparison??
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Old 05-12-11, 04:03 PM   #3
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will removing the rear mufflers increase performance?

I mean the ones at the very rear. Also, Is the exhaust on the gs400 similar to ls400?
No, only noise. There 2 resonators, not to be confused with cats, and 3 mufflers. Try unbolting the mufflers at the rear axle and tie them up out of the way of the exhaust, rev the engine a few times and see if it's for you.

What's your definition of similar? Yes, their both V8s, yes they both have y-pipes with dual exhaust. The GS400 and later model LSs got a higher, I believe 10.4:1, which increased the power, as well as the introduction of VVT-i.

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Old 05-12-11, 04:06 PM   #4
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No, only noise. There 2 resonators, not to be confused with cats, and 3 mufflers. Try unbolting the mufflers at the rear axle and tie them up out of the way of the exhaust, rev the engine a few times and see if it's for you. Good luck.
Are there not 3 Cats, 2 Resonators, and 2 Mufflers..?

At least that is how mine was.
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Old 05-12-11, 04:39 PM   #5
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Originally Posted by Hilux22RE View Post
Are there not 3 Cats, 2 Resonators, and 2 Mufflers..?

At least that is how mine was.
Yeah same with my car. California cars have a 3rd catalytic converter in place of the 3rd resonator found on non-CA cars.
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Old 05-12-11, 05:04 PM   #6
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Yeah same with my car. California cars have a 3rd catalytic converter in place of the 3rd resonator found on non-CA cars.
Now is the 3rd Cat needed?? Or can i get that S*** Cut off?? i was thinking about it but i was thinking it might affect the Smog status...
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Old 05-12-11, 08:32 PM   #7
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some UCF10s had a 3rd cat, but not all. you could probably ditch it without adverse effects but for smog....who knws.
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Old 05-13-11, 01:05 AM   #8
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removing the 2 resonators and that 3rd cat is Ok Passed smog easily
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Old 05-13-11, 04:30 AM   #9
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Just run open headers, you will probably lose power down low but gain it uptop and it will sound great!
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Old 05-13-11, 06:00 AM   #10
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Sorry, I didn't know Cali cars had a 3rd cat, now I do.
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Old 05-13-11, 06:11 AM   #11
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Just run open headers, you will probably lose power down low but gain it uptop and it will sound great!
Now that would be loud.
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Old 05-19-11, 10:19 PM   #12
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just run a cutout
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Old 05-20-11, 01:14 AM   #13
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just run a cutout
this would help how exactly....?
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Old 05-20-11, 07:40 PM   #14
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dont do any of the mentioned above. messing with the back pressure of the exhaust will eventually(it will take a while but it will happen) start bending your valves. just get a custom exhaust from a muffler shop. they can tuck it up for you so it can be hidden if you would like.
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Old 05-20-11, 07:49 PM   #15
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How would reduced back pressure bend valves Exactly...? I Have never heard of this happening. any links to articles or info on this??
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