I read in the technical section about the airbox mods and the vectra c pipe and have some questions.
Is the derestriction of the airbox okay for the 1.7tdi as well as the petrol engines?
What year does the Vectra inlet pipe need to come from?
Other than the K&N/Piper Cross etc panel filters is there an induction filter that works for the deisel engines?
Do the above mods (airbox, filter, inlet pipe) make sufficient gains to make it worth doing?