If high spring rates are what you're after, the TT boys rave about GAZ Gold coilovers. They're custom made in the U.K. To your spec so take a few weeks to put together. Good for track cars as you can specify stiffer springs.
Apparently after sales support is good too.
I priced them up for my mk1 TT track car at £980 from memory, but I wasn't patient enough to wait the 4 week lead time so got some ST XA's (basically KW v2's), which were a couple of hundred cheaper too.
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Thanks for the recommendation but I suffered severe quality issues with a set of those on my Corrado. That was about 11 years ago though, so I would hope things have improved since then, but the experience has put me off them for life unfortunately.
Besides which, they don't list anything for the MK5 platform, which I think is due to fierce competition from established and well respected rivals. The VW aftermarket is dominated by the European tuners, so a tough market to get into for a small UK company.
Gaz are predominantly ex Leda employees, and Leda were kind of niche motorsport damper makers back in the day. MK2 Escorts and the like, so that was and probably still is their main customer base.
Ohlins generally find their way onto some of the best cars in the world, but that doesn't necessarily make them the best for this application......it's mainly the dual flow valving to soften sharp bumps that interests me. And I like monotubes.....just not Bilsteins because their high speed compression valving is ridiculously stiff, which doesn't feel settled until you're travelling at very naughty speeds on the roads.