Have just changed the vacuum/boos pipes(4mm) and i have the same report as others all good nice smooth boost, The only question i have and have searched everywhere is do they have to be a certain length, Only asking as if you look on the sticky thread about vac/boost pipes on the first photo the pipe adjacent to the vaccum pump under yellow oil cap is alot shorter than mine and everyone elses i've seen photo's of also checked ebay for engines for sale and every pipe is not passing the side of the vacuum pump, Only asking as the pipe in the picture is an original vx one and just wondering whether the extra bit is making the pump work harder.
Thanks Tommy