sounds the goods but would have been nice to know how much of an increase was gained, what is the fuel bill like, is yours a manual or auto. i have an 86 manual with 35 bfg and my brother has a 87 auto with 33 and mine has about 150 k more kilometers on the clock at over 450 k. saying that he is unable to keep up as mine has more grunt up hiils or on the flat and both engines seem to be stock ,factory boost ect similar weight ect but would always like a little more poke