After new + Cable installed and Current distributor given a new lease of life, the difference is quite amazing ! The Boxster must be a greedy animal when it comes to current.
The old + Cable was less than 1/4 corroded through and had never had any trouble starting at all.
I've noticed when driving now, that there is no hesitation and the revs pick up very quickly. When depressing the clutch and letting the revs drop off, they never drop below 800 now, where as before they would drop to almost 200 before idling around 900.
The Current distributor fuse-able links had square washers between them and the shake-proof nuts, so even more area available for corrosion. I removed the washers on all terminals and replaced the nuts with new ones after thoroughly cleaning all posts and links etc.
I can certainly recommend servicing the Current Distributor on these older Boxsters !
