ill take on a valver in my sri ,its also an 8 valve only has a k&n 57i and remus back box, 93 on a k done 150000 miles , only other mod is the gearbox, sri ratios are too short for the 8 valve lump so put a cdi gearbox in it . as the power is up on an sri compared to the cdi it pulls it superb ,how does 72 in 2nd /110 in third /135 in 4th/ and estimate around 160 in 5th as it hits the limiter in 5th with ease .the speedo is reading correct as ive checked it against a calliburated one and its spot on, to within 3mph. as an example it revs on 3k in 5th at 90 mph!! although i will say from the lights youd most probably leave me but by third gear id be back in it. would be interesting to try , had a go with a 172 the other night but he wouldnt play.