Scorpion exhaust and K&N or not?
I want to fit a cat back exhaust or back box and filter to my 53 Astra SXi and wonder what you recommend?
Re: Scorpion exhaust and K&N or not?
Apparently the best way is to de-restricted the air box, add a performance panel filter and instal a larger air intake pipe rather than swapping it for an induction kit.
If so does anybody advise K&N or Pipercross filters or where to get the other required parts from?
And how easy is it to de-restricted the air box?