I'm getting a strong exhaust smell inside the cabin only when I'm in boost 10+ psi at idle and normal driving I have no exhaust smells incabin. I had the megan manifold on the car which was cracked replaced with ported and coated buschur manifold I also went ahead and did o2 housing while I was at it. All new gaskets on the manifold to the head manifold to the turbo and o2 housing all torqued to spec. I've checked and re-checked and can not find a leak on the head side. So I'm thinking it's where the down pipe meets the cat. I also had the shop that did my fluid change check and they did not find anything. AFRs on the apexi narrow band are very normal 14-3-14.5 at idle so I don't think its head side. It does dip in 10.0AFR at full boost but I need a tune for that problem. It does have a HFC and espelier jsg500 exhaust.

 

if u are running that rich at wot then that could be what you are smelling if everything else checked out

 

What torque do you have to have on the DP and cat??? I'm just waiting for the DP then I'll be installing them both on my Evo this Monday. I can't wait. Let me know asap. Thanks

 

From the DP to cat i'm not sure but downpipe to o2 housing was 42-46 ft lbs.

 

Did you DIY or did you have a shop install the DP and Cat for you?

 

the dp to cat install was done by previous owner. i re bolted the dp to the o2 housing with a new donut gasket with no problems.

 

bump

 

ordering ams test pipe tomorrow hopefully find the culprit there

 

Turns out to be the v-band clamp for the turbo I finally saw the soot buildup, I tried to tighten it down some looks like it worked itself loose. I'm going to try again later clean it off see if comes back or all is good.

 

Keep us posted. I get the same thing right now and have been too busy to investigate.

Did it fix it?

 

Yes it did end up fixing my problem. Guess with the heat making it expand then tighten it up I haven't had a problem since.

 

don't mean to thread jack but is replacing the doughnut gasket recommended? i just re-used mine and haven't had a problem but i'm wondering if i should replace it...

 

Me personally I didn't. I just re-used it.