These things work very simply by inducing cold start in the cars programming and throwing more fuel in... which when it's warm will overfuel by a degree, and could lead to serious engine damage over time.Originally posted by Andy Bowles:
I know thread is a bit old but here goes....
Go onto ebay and type in search box: 20 BHP
You will get a big list, but no need to go past top 2 or 3 items.
A tiny resistor that can give up to 20 extra BHP ( more likely 6 or 7 BHP !! - Equivalent to a better octane fuel maybe, but I am not technically minded).