Mine does this occasionally too. Smells kind of like hot brakes, but I only get it under hard acceleration. When I was researching buying a G before I bought this car I remember an issue where oil was pooling around a rear spark plug. Haven't looked at mine yet. It is really not too bad at this point, and since it really doesn't seem like oil I haven't been real concerned.

Another weird smell issue I have is when the car sits overnight on a cool night, when I start the next morning with the AC on Fresh, within 10 sconds a strong hot plastic sort smell that goes away within another 10 seconds. Won't do it again until it sits overnight on a cold night.

Just last night I noticed a weird smell while driving on the highway. Have had HFCs on over a year with no issues. I thought it was a beater car up ahead spewing off gas or fumes, but once I was in the clear the smell was still there. Smelled kind of like a freshly tarred road; oily gas odor. Around town no strange odors. I haven't been on the highway since to see if it happens again. Hope my HFCs aren't on their way out.

Yes! this is the the same smell this weekend, this wasn't there before HFCs so im guessing this is def the case, as my brakes work just fine and had no such smell under hard braking as well. :driving:

Yea mine does it to , I'm not worried. Kinda smells like a race car

I sometimes get the same "gunpowdery" smell on hard acceleration in my '09 Touring. My theory is that the cats are temporarily overloaded and I am smelling unburned hydrocarbons and products of incomplete combustion (PIC) (eg, CO, incompletely burned gas, &c) that are making it through the cat. I'm assuming that, with a modern, computer-controlled engine, unburned gasoline will be a very minor component, so PIC will be what is making the smell. YMMV.

ive noticed that this is only during really hard acceleration though and I mean full throttle pedal to the medal and a couple pulls. Other than that she doesnt burn or smell. :driving: So for now its good, and I think quite normal.:tup:

Just switch to test pipes and learn to leave your car on recirculate and never, EVER put the windows down, like me, LOL

I'm getting that awful foul smell as well. I notice it within the first 5-10 seconds of starting up my car. Ive come to believe that its my Berk HFC. Its never smelled anything like this before. Ive had my twin turbo kit installed for about 7000km, so Im guessing that the element in the HFCs are burning up from the extra heat.

My solution is that Im just going to completely swap out my Berk/Stillen combo and replace it with 3" GTM down pipes, and the 3" FI exhaust. If it still smells after the swap, then Im going to have to check my tunes because Im running it rich.

I would be willing to bet that that most tunes run rich to be safe....ESPECIALLY when under WOT..... when you add HFCs or test pipes, you are going to smell the unburnt fuel smell. Its not that bad

Just bought a 2010 Nismo with 58k miles. FI HFC and full MXP Exhaust and I have the same issue. It’s like a really strong exhaust fume smell in the cabin. Anyone ever find the solution for this?