and about your car burning rubber, or not really being able to for that matter.. have you checked the air filter lately? fuel filter? my diesel went a little better when i put the K&N out of my GTI in it.
i could tell a difference from the stock diesel n/a intake, and a gasser n/a intake. it ha dmore low end power. and i doubt that is just because the intake runners have been smoothed out. not even ported, just smoothed.