hi,
i now have the Roetelle-racing bellts (shorter & slick) for a 68mm pulley + a STEEL 68mm pulley (not thooted) on my G40 and damn! that makes a hell of a difference. were i always had slip on higher (5000+) revs with the bellts & alu pulley i bought from SLS tuning,
these new ones do not slip at all, even above 6000 rpm. (i had never been able to go there on full boost before
)
i m happy! perhaps for more hp thooties are neccesary, but with a little chip like mine, not needed at all after all