front exhaust pipe leak ls430
07-12-18, 07:54 PM
#16
Lexus Champion
Sorry to bump this thread again but my 02 LS 430 needed the same exhaust repair. I went to American Muffler in Ft. Lauderdale, FL. They charged $250 to replace the pipes, from behind the O2 sensors to the front of the catalytic converter, including the y-pipe. They did a great job at what I think is a reasonable price. However, they did not put back on the heat shields. Will this result in any codes? Will the exhaust gases cool too much before going through the catalytic converter? Will this affect the gas mileage? Maybe I will post pics if anyone is interested.
Probably also reduces heat soak into surrounding systems and components on shutdown.
Hope you saved your original shields.
Hard to understand why any reputable muffler shop would overlook this.
Have the installer finish the job
Explaim it to them they are identified in a Clublexus forum posting.
Also, ask them what type and grade of steel used...
Share your findings.
Last edited by YODAONE; 07-12-18 at 08:02 PM.
07-12-18, 11:37 PM
#17
The OEM installed heat shields maintain exhaust velocity, improve efficiency of catalytic converter on start up, increases catalytic converter life, decrease heat dissipation unto undercarriage and increase engine output.
Probably also reduces heat soak into surrounding systems and components on shutdown.
Probably also reduces heat soak into surrounding systems and components on shutdown.
Decreasing heat dissipation into the undercarriage I can definitely understand, but other than having a slightly warmer dashboard/floorboard/tunnel, wouldn't think that this would really be of any concern.
A heat shield being able to improve the converter's efficiency on startup and increase it's life? How does this work?
Increase engine performance and maintain exhaust velocity?
I'm trying to visualize all of this, and am having a hard time figuring it out.
Now this, I like lol. That should get their attention. Maybe preface this by saying how many members the site has since they might not have heard of the site and might assume that we only have a handful of members?
07-13-18, 03:50 AM
#18
Driver School Candidate
I can understand some of the effects because the heat shields would maintain a fairly even temperature inside the exhaust, especially in cold climates. However, In my case, with the warm weather in South Florida, I don't think there would be much effect on the car's performance. The muffler shop is a very reputable business that has been at the same location for the last 30 years. They seemed to be very familiar with this problem on the car and even said they do this repair for cars that come from the local dealer, JM Lexus. In any event, I have the removed heat shields in a box in my trunk which I kept just in case there is a problem and I think I need to re-install them.
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sharp1300
RX - 1st Gen (1999-2003)
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06-27-18 02:01 PM
