even my mates said the mixture smells too strong, would the manifold back janspeed exhaust along with k & N be a problem or cause?
how much is a lamba sensor? and is it best to get standuard nissan one?
To be honest no human can tell how much fuel is going in a car by the smell of it. So you have a choice of testing and seeing definatively and then knowing for sure or just guessing and probably getting it wrong.