Originally Posted by stevieturbo

It really depends how sensitive the ABS system is. Some will dislike any tampering, only way to find out really is to try..

Being an older system, it might be a little less fussy than some modern stuff though, or you can get VR to digital converters that really shouldnt appear any different to the ABS system that say a multimeter or scope hooked up so again, probably shouldnt pose a problem.

As for how much is usable...depends how you want to use it lol. I'd like to think that on a good dry day with good tyres etc, 4-500hp should be quite reasonable