Well after an amazing amount of time flitting between Manufacturers, how much I can justify spending, do I need to justify etc, i've made a decision. It's wierd, I kind of feel like I'm letting the side down not going KW co's or the B12 kit, but I've gone for Eibach pro kit springs and Bilstein B4 dampers for a few reasons.
I had the B12 kit on my 156 and didn't like it unless I was hitting a smooth fast bend, so have always been a bit put off getting it for the 159. I've been in a 159 with it and it was tbh, but I see so many reviews that nearly always start with 'it's so hard, hope I'll get used to it', but then people seem to get used to it, maybe it wears in.
The FSD/Eibach combo is great on my Gt, but I remember the ride was terrible with 18" Pirelli's, so I was a touch worried that the same combo on 19" even with flexier sidewall tyres might be a disappointment and they aren't cheap, I don't even think you can get the FSD's for 159's anymore anyway.
I badly wanted KW V2's as I'd sworn never to buy unadjustable dampers ever again. 2 problems- bank breaker at £1200 and also remember Clogz mentioning that the spring diameter was relatively thin. I use the Sportwagon with a 4 bike rack on the back and fairly loaded- i don't want to be worrying about snapping a spring.
So it was back to Koni sports for the adjustability. Read quite a bit from American suspension tuners over the last couple of years and it seems that very rarely are the Konis actually matched to each other, they often have to be dyno'd. The adjustability is apparently questionable too. However, i went to order a set.
When I tried to order the Koni sports (Alfisti), i was asked why I didn't want the cheaper B6's. Told them the whole story, i.e. it's not a racing car, it's a family bus that needs to still look good, but have a decent ride around town. It ended up with a B4 recommendation for my needs. I think it was 159kid on here that I read a couple of weeks ago was going for the B4's and Prokit on his 159, I thought (sorry 159kid) is he mental? Putting B4's with lowered springs-nutter.
Anyway I can't find any bona fide literature saying that B4's can be used with lowering springs, but B6 can be used up to 30mm so I figure so can B4 as they're both regular length. Many people say B4 are 10% stiffer than OEM, however Bilstein say they're the same as OEM, it's just they're newer, so feel stiffer. There are a lot of BMW M-sport suspension owners that have them as direct replacements, on the whole the reviews seem very good.
I'll also be replacing all drop links, strut top mounts, tie rod ends and upper wishbones, so it's a decent outlay made a lot better by the fact the dampers, springs and delivery were only about £330. If the dampers aren't good for me, it's not much money wasted.
Cannot wait to fit it all, but it's going to be a while yet.
A few good Q and A's hear FAQs