Hey everyone, I own a 2007 g35 coupe 6mt with a cold air intake. I have noticed when driving my car if i decide to really rip it it smells. It only happens when i go past 4000 rpms. I was wondering if it is normal for it to smell like burning exhaust fumes or if i need to do a fuel system clean or something. I was wondering if everyones does this. Any help is appreciated.