Catted Downpipe Smell?

[jchadwell]

I noticed it just a little the first few times I started the car. Now I don’t. Not sure if I just got used to it or maybe it has sealed a bit better over the miles.

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[razorlab]

My GESI cat doesn’t smell. Only time I smell something is on cold starts but after it’s hot no smell. I ran catless on my other cars for twenty years so I know stinky.

 

[ethanc]

Gonna bring it back to the shop today to have them check for any possible leaks around the DP. CEL was also just thrown this morning for the first time, after driving ~110 miles since install. Not going to clear it yet until I take it in

FWIW, I have the new “v3” non-gesi version, hopefully there isn’t any real world difference with smell in that version and gesi version

 

[Timmy_Jones]

I have the V2 AA catted w/GESI and there is a faint smell behind the car. Never in the cabin

 

[ethanc]

I have the V2 AA catted w/GESI and there is a faint smell behind the car. Never in the cabin

Cool, thanks. Even when stopped at a light? That is my main concern, smell outside cabin is fine, but inside cabin I definitely don’t want. We’ll see what they when I take it in, hopefully it’s something wrong with the install that’s causing the smell and the CEL that just popped up

 

[MoTeC_R]

I’m running the AA, it’s been on for a couple years. Everyone that gets in my car always asks how I keep it smelling like new. I don’t notice any smell and even my wife who would smell the slightest hint of anything and she’s never said a word. I’ve had catless or high flow catted Downpipes on most of my vehicles over the years so I’m very familiar with the smell, but don’t notice any smell on the Supra.

 

[ethanc]

I’m running the AA, it’s been on for a couple years. Everyone that gets in my car always asks how I keep it smelling like new. I don’t notice any smell and even my wife who would smell the slightest hint of anything and she’s never said a word. I’ve had catless or high flow catted Downpipes on most of my vehicles over the years so I’m very familiar with the smell, but don’t notice any smell on the Supra.

Do you have air recirc on or off?

 

[Extreme Power House]

I’m running the AA, it’s been on for a couple years. Everyone that gets in my car always asks how I keep it smelling like new. I don’t notice any smell and even my wife who would smell the slightest hint of anything and she’s never said a word. I’ve had catless or high flow catted Downpipes on most of my vehicles over the years so I’m very familiar with the smell, but don’t notice any smell on the Supra.

you have catless now?

 

[MoTeC_R]

you have catless now?

No I’m on the Catted AA downpipe.

 

[MoTeC_R]

Do you have air recirc on or off?

Either way I never notice any smell. That’s one of the reasons I went with the ActiveAutowerks is catted and no cel before I tuned. I’m tuned now but the 1st year with it I was not.

 

[ethanc]

Either way I never notice any smell. That’s one of the reasons I went with the ActiveAutowerks is catted and no cel before I tuned. I’m tuned now but the 1st year with it I was not.

Perfect, that’s what I wanted to know. I’m taking it to a different bmw shop today to have it checked for any leaks along the exhaust or dp/turbo. I brought up the smell issue to the original install shop and they said they just needed to tighten down the v band a bit more. But smell is def still very prominent with recirc off, so def a leak somewhere. Hoping it can get identified and fixed today!

 

[MoTeC_R]

Perfect, that’s what I wanted to know. I’m taking it to a different bmw shop today to have it checked for any leaks along the exhaust or dp/turbo. I brought up the smell issue to the original install shop and they said they just needed to tighten down the v band a bit more. But smell is def still very prominent with recirc off, so def a leak somewhere. Hoping it can get identified and fixed today!

Yes I’d say you probably have a small leak. I had mine professionally installed by a friend who is the master tech at a BMW dealership and I’ve never had any hint of a smell. I had it installed at the same time as the Eventuri intake. I wanted it done right because I heard people installed the airbox and had problems with it slipping off and I’ve had none of those issues either.

Are you also running the AA? May want to buy and install new clamps in case one got damaged during the install?

 

[Extreme Power House]

No I’m on the Catted AA downpipe.

 

[BA9092]

I bought my AA catted DP back in March of 2021. Not sure what version that would be but never had an issue. However, it definitely smells during cold starts. Just not as bad as catless.

 

[Extreme Power House]

I bought my AA catted DP back in March of 2021. Not sure what version that would be but never had an issue. However, it definitely smells during cold starts. Just not as bad as catless.

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