Are Straight Pipes on LS430 Bad for the Car?
#1
Rookie
Thread Starter
Are Straight Pipes on LS430 Bad for the Car?
So let me start with, I completely understand and respect that the Lexus LS430 is a refined luxury machine, engineered largely for it's smooth and quiet style. That being said, I have seen a few videos where people had removed the 3rd catalytic converter and run straight pipes. Not sure if they have mufflers or not.. They sound pretty good! I'm wondering how this effects the engine and computer systems. Any advice on systems such as this?
Thanks
Thanks
#3
Removing catalytic converter.... I am not a lawyer, but I am pretty sure that is illegal. Also, it is not good for the environment.
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nbizzle (03-14-19)
#5
Lexus Champion
As a test I pulled off everything after the front Y on my 99 and it was LOUD and actually seemed to have lost torque. Of course this shortened the system and created resonance as the outlet was basically in the middle of the car between the road and floorboard. What is your goal?
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nbizzle (03-14-19)
The following users liked this post:
nbizzle (03-14-19)
#7
Rookie
Thread Starter
So, am I right in assuming this would give me some sound, preserve all factory engineering (other than quiet of course), and not harm anything, other than noise pollution?
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#8
Rookie
Thread Starter
As a test I pulled off everything after the front Y on my 99 and it was LOUD and actually seemed to have lost torque. Of course this shortened the system and created resonance as the outlet was basically in the middle of the car between the road and floorboard. What is your goal?
#10
Advanced
iTrader: (1)
Don't think removing the final converter will adversely affect anything, seems plenty have done it in the past when doing custom exhausts. I definitely wouldn't straight pipe it, but an X-Pipe and a pair of nice mufflers would probably give you the sound you're after, and not annoy you with drone when cruising on the highway.
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nbizzle (03-14-19)
#11
Driver School Candidate
So let me start with, I completely understand and respect that the Lexus LS430 is a refined luxury machine, engineered largely for it's smooth and quiet style. That being said, I have seen a few videos where people had removed the 3rd catalytic converter and run straight pipes. Not sure if they have mufflers or not.. They sound pretty good! I'm wondering how this effects the engine and computer systems. Any advice on systems such as this?
Thanks
Thanks
#12
Lexus Fanatic
My understanding is that back pressure is needed. Which is why vehicles with true duals (Ford Raptor V6, certain BMWs like mine, blah blah blah) usually have X and H pipes if you look at the system in its entirety. Most vehicles of course have fake duals like our LS430, so could be altering it is fine.
Perhaps the best analogy is when one drives a car with a broken exhaust all the way to the cat. It is actually quieter at a sweet spot (rpm and mph), than it is at idle, as well as WOT.
I have always wondered when and why car cos. put fake duals on. But today? They even have fake outlets!! Look at a brand new Audi Q5 or S5. Or a Toyota Camry with dual tips. That is pretty sad imho, and takes fake duals to another level.
Perhaps the best analogy is when one drives a car with a broken exhaust all the way to the cat. It is actually quieter at a sweet spot (rpm and mph), than it is at idle, as well as WOT.
I have always wondered when and why car cos. put fake duals on. But today? They even have fake outlets!! Look at a brand new Audi Q5 or S5. Or a Toyota Camry with dual tips. That is pretty sad imho, and takes fake duals to another level.
#13
I saw that fake duals on Camry the other day! I could not believe my eyes lmao
#14
Intermediate
Connected
Even two cylinder motorcycles generally have the two connected for the exhaust. A 'balance pipe' is employed that connect the two exhausts together, they then exit as two pipes.
#15
It's funny, I'm actually having the opposite problem. My car has an aftermarket Magnaflow on it that's barely noticeable and adds a bit of "oomph" at wide open throttle. I just want to go back to stock tips because I'm a #StickWithStock guy, haha.