Originally Posted by rstdaz

a friend of mine had a 12mm spacer fitted to his 2wd saff and also fitted a 4wd inlet manifold which he had polished inside. the car made 402bhp before it was fitted and after made 428bhp. we did this all in 1 day to see what effect it had on the power and after the 1st run we thought it was to good to be true so did some more runs on the rollers and it came back roughly the same.