I have a 1.6 8V X16SZR engined Astra G. I would like to warm it up a bit and make it a bit more responsive. I am looking to change or mod the air filter and have seen the how to. I have also seen the K & N Cold air Induction kit which replaces the stock air filter box.
Can anyone tell me which give the best increase in performance? As a matter of course, if I stick with the stock air filter box, I will derestrict it, change the inlet hose for the Vectra C diesel induction hose, and will change the filter to a decent K & N or similar panel filter.
I want to keep the MPG or improve if possible, but make it a bit more responsive.