what's the cheapest way to boost the output of a 13 yr old 1.6L astra engine? (16SV, 1598cc OHC 8v)
At the moment it's not got much (60bhp according to the user manual, but I reckon it's closer to around 80). I've heard of induction kits and the like, but I've also heard that they add bhp to your engine in single digits - I'm after a bit more than that . . . . ideally.
Thanks for any advice,