2k4CamkilA

I have a hole in my flexpipe, will my car pass inspection?

...probably wont considering it has to do with emisions

Hayk

iTrader: (1)

Depends on your location and how they perform the inspection. In NJ, it's just an OBD2 computer check.

2k4CamkilA

Yea, I live in NY

hypervish

That's how they check emissions and system status'.

speedkar9

Speaking of a leaky flexpipe, anyone know how to replace it on these V6 1MZ / 3MZ engines?

The front of the flexpipe seems very tight with the U-turn from the rear exhaust manifold to cut and weld or clamp on a universal one. The flex pipe and catalytic converter unbolt as one unit but is expensive to replace.

hypervish

My Sienna has a similar flexpipe to the ES, and my uncle (ASE certified mechanic) was able to cut out the flex pipe and weld in a new one. Just as he would on other 1MZ-FE engines such my RX300 that don't have the same exhaust setup as these.

Some other shops won't do it though on these, because as you mentioned it's very tight.

speedkar9

When you get a chance, can you nab a photo of the new welded flex pipe? I want to see where it was cut. I assume your Sienna is 3MZ-FE?

I'm thinking I can cut the pipe and clamp in the universal flex pipe myself, and take it to a shop to weld to save me some dough.

hypervish

I'm out of state right now, but once I'm back I'll take a picture and PM it to you. It has the 1MZ-FE though. The exhaust is similar in the way that it's shaped however it has two flex pipes compared to just one on the ES.

Mythotical

I copy pasted this from one of my early postings here, hope this helps.

"I also had the factory exhaust leak at the front of the flex pipe so I cut it off at about 8" behind the support bracket that mounts to the sub frame and then I got the assembly for a 98 Camry. The cool thing is that the Lexus pipe is double walled and the Camry is not however the Camry Exhaust slid perfectly between the walls, over the inner and under the outer and the flanges bolted up perfectly".

speedkar9

Thanks, maybe you can post the picture here.

I found this shop's website that does exhaust work, and they have lots of pictures of Lexus / Toyota vehicles for reference:

http://www.lgauto.ca/Lexus.html

http://www.lgauto.ca/toyota.html

I'm reading that these pipes are double walled. What does that mean? Is the 2.25" outer diameter including the outside wall? Is that what you'd clamp or weld to, or is that just the heat shield?

Mythotical

No, they are double walled to be quieter. That is all. And in fact that also means that the Camry exhaust is slightly bigger on the inside.

speedkar9

So what does that translate to if I want to put in a universal flex pipe? Will I get more noise? Would I be matching the outside diameter to clamp and weld to? What would the inner pipe fit to?

Thanks,

Hayk

iTrader: (1)

Yeah, it's gonna sound like a Camry.

Mythotical

Not exactly like a Camry but close. The problem is that if you weld or clamp over the outer pipe, you will have a void for condensed exhaust vapors to build up into and this will cause corrosion within the two layers. The reason I used the collector and flex pipe assembly out of a Camry is that it fit over the inner and under the outer tightly. When I cut off the Lexus pipe I used a tubing cutter to cut the outer and then move back one inch then cut the inner. then when I put it together I welded two beads close together on the inner and then the outer to the end of the Camry pipe joining and sealing all of it together. It worked perfectly and only sounds a little; dare I say, "throatier".

NOTE: My ES is California emissions, the Camry assy I used is Federal. Thus I removed the upper cats. Legal in my state. And I get no CEL only because I also modified the down stream o2 sensor bung. (Not necessary if yours is a Federal car).

speedkar9

Exactly my thoughts too.

So you've actually welded the inner pipe separately and then the outer pipe? What if I clamp or weld onto the inner pipe with a universal flex pipe? Are both the downpipe and cat pipe double walled?

I wonder what an exhaust shop would do, forgo the inner pipe and weld on the outside...?

http://www.lgauto.ca/Lexus.html

Before:

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