I want to give my valves/tappets a clean (heard of people calling it top end treatment) and wondered if anyone knew of any additives that would do the job. I've heard Wynn's, STP and Redex do such products but are they any good?
I've also heard of stuff you put on and around the spark plugs and wondered if anyone knew anythink about this?
Also, I'm thinking of getting a replacement filter element for my MK3 2.0 16v Astra and wondered which is best and what other people have done to theirs? Is this airbox drilling of holes a good idea as well or not?
I also wanted to know what the best exhaust would be for my car for performance. I want a stainless one and if possible would like it to be legal for MOT's etc.
Thanks for your help. Brian