GS400/430 Test pipes??
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Driver School Candidate
Joined: Jul 2010
Posts: 11
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From: Texas
GS400/430 Test pipes??
I have been searching for the past few days for a set of Catalytic converter delete pipes (test pipes) and have not been able to find a company that makes them. Is there a company who produces these?? I would prefer not to gut my cats just in case I ever want to put them back on. Are there any performance gains to be seen with these? Do the after market headers for our cars delete the cats? Sorry for all of the questions, any help will be greatly appreciated. 
Edit: also, are there good aftermarket engine mounts for the GS's? Will the SC400 mounts work on a GS? I'm pretty sure my mounts are pretty much gone. (Low idle, less responsive, more vibration, etc....)
Edit: also, are there good aftermarket engine mounts for the GS's? Will the SC400 mounts work on a GS? I'm pretty sure my mounts are pretty much gone. (Low idle, less responsive, more vibration, etc....)
Last edited by 92sc250tt; Apr 9, 2012 at 06:48 PM.
Driver
Joined: Jun 2010
Posts: 153
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From: TX
The cats unbolt, why bother welding? With stock manifolds, you should see minimal to no gain. The factory manifolds are the bottleneck. The car is also not tuned to run without cats. I have a host of de-catted cars that are raced and I can speak off first hand experience, you need some adjustment for almost every modification you make. If you're dead set of decatting your stock Lexus have an exhaust shop make you a test pipe. After laughing at you, they should only charge a couple hundred dollars.
Driver
Joined: Jun 2010
Posts: 153
Likes: 1
From: TX
Also the motor mounts are not going to effect the idle or the responsiveness (well, BARELY). With the age of the car, I can tell you the mounts are probably worn. As of now, you can either go a custom route or just get stock replacement. Which, for your power levels, will be fine.
Thats true.
The cats unbolt, why bother welding? With stock manifolds, you should see minimal to no gain. The factory manifolds are the bottleneck. The car is also not tuned to run without cats. I have a host of de-catted cars that are raced and I can speak off first hand experience, you need some adjustment for almost every modification you make. If you're dead set of decatting your stock Lexus have an exhaust shop make you a test pipe. After laughing at you, they should only charge a couple hundred dollars.
Thread Starter
Driver School Candidate
Joined: Jul 2010
Posts: 11
Likes: 0
From: Texas
The cats unbolt, why bother welding? With stock manifolds, you should see minimal to no gain. The factory manifolds are the bottleneck. The car is also not tuned to run without cats. I have a host of de-catted cars that are raced and I can speak off first hand experience, you need some adjustment for almost every modification you make. If you're dead set of decatting your stock Lexus have an exhaust shop make you a test pipe. After laughing at you, they should only charge a couple hundred dollars.
As far as the engine mounts go, They can cause Excessive vibration, loss in power, and a low idle. When the rubber in the mount wears out/ tears the engine shifts a lot more than normal. When the engine moves you lose power/responsiveness due to the drivetrain flex. I was just wanting to know if there was an aftermarket replacement already. The way I see it is when something wears out, Replace it with something better. I don't like to spend money on parts that just keep my car stock.
Thanks for the help, It's looking like they don't make s%!t for these things! haha
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