97 LX450 / 80 Series - Inside Frame Rail Exhaust Using 105 Series Downpipe (2 Viewers)

[Broski]

This may be a dumb question but why do the 95+ have two cats? I get the 94 because the exhaust is split but why two in line?

I think it's the same thing, the 95+ is the same split exhaust the two to one is just before the cats instead of just after.
Another option for the 93-94s is to use the 95+ two into one cat eliminate/don't use the second cat and do a cut and turn on the first cat so it's flat instead of hanging down.
I have the parts to do this on my 94 but was waiting for the cats to die but they just won't die it's been 6 year since I got the parts the cats look smashed and mangled from uncountable hits in the rock same with the OEM muller but there's no leaks and it stills passes smog.

 

[mrnotch]

any update on this thread. Im looking to do this to my Lexus as we speak. It seems as though the downpipe is no longer available. Any other options.

 

[bonestock]

any update on this thread. Im looking to do this to my Lexus as we speak. It seems as though the downpipe is no longer available. Any other options.

Add it to your wish list on partsouq.com and they will email you when it becomes available.

 

[mrnotch]

Add it to your wish list on partsouq.com and they will email you when it becomes available.

unfortunately, the website will not allow me to do that I see it available at others though... thanks for the reply definitely want to do this...

 

[alia176]

The 105 downpipe is a cool alternative to the usual over/under thing that I did with my turbo'ed exhaust. For ease of installation, I did use V band clamps everywhere, but it does add to the final cost quite a bit. However, the ease of future removal is a pleasure and not having to worry about gaskets is also quite sweet.

Keep up the good work!

 

[COS80]

I couldn't tell in your video... what'd you do about the damper on the transfer case? Bend over it or remove it entirely?

 

[bonestock]

I couldn't tell in your video... what'd you do about the damper on the transfer case? Bend over it or remove it entirely?

Removed entirely.

 

[COS80]

So what happens without it?

 

[bonestock]

I think I go faster now. No noticeable change without the dampener.

 

[COS80]

I tracked this thing down (I think) - p/n 36336-60010, "transfer heat insulator". I can't find anything on what it actually does, though.

 

[joxeale]

My exhaust is too far gone and i'm gonna go this route. Can you post a pic of where you welded the O2 bungs? No codes without cats? TIA

 

[bonestock]

I am throwing codes currently but am working on a solution. Will report back once I can move back into my garage due to a home renovation resulting in a vehicle eviction...

 

[JoeCova]

I am throwing codes currently but am working on a solution. Will report back once I can move back into my garage due to a home renovation resulting in a vehicle eviction...

Are you back in the garage?

I have the 105 downpipe just need to figure out the rest.

 

[alia176]

No codes without cats? TIA

this will never happen! The ECU is looking for an O2 sensor voltage reading pre and post cats, compares them, then trips the P0420 CEL as needed. About the only way to fool the ECU is to feed it a voltage from something that resembles an O2 sensor (0-1vdc) and it has to be a "lazy" version of the voltage of the AFR sensor (pre cat sensor). So, you might as well have a O2 sensor bung + O2 sensor then a DIY circuit to modify the voltage before going into the ECU. This is easy and cheap to do , just google for the resistor and capacitor values.

 

[Rwhat]

this will never happen! The ECU is looking for an O2 sensor voltage reading pre and post cats, compares them, then trips the P0420 CEL as needed. About the only way to fool the ECU is to feed it a voltage from something that resembles an O2 sensor (0-1vdc) and it has to be a "lazy" version of the voltage of the AFR sensor (pre cat sensor). So, you might as well have a O2 sensor bung + O2 sensor then a DIY circuit to modify the voltage before going into the ECU. This is easy and cheap to do , just google for the resistor and capacitor values.

I was thinking about that also. I ended up keeping 1 cat on my 1996 to keep the CEL happy. I couldn’t find any reliable info to fool the post sensor. Maybe I didn’t look hard enough. I did go with a threaded bung style Denso pre car o2 sensor. Was easier for me to tig weld then the thick flange mount.

 

[alia176]

study up on this here