Ground Control makes some very high quality stuff. I personally have their street no-compliance camber plate top mounts for my car.
The sleeves that they make will transform any shock (preferably Koni) into a coil-over. These are a slightly cheaper alternative to more expensive coil-over setups, but with the quality to match.
I have had fantastic customer service from them and very quick shipping/turn around times. Just my .02 cents.
Although I know many people highly regard koni yellows with GC sleeves, you should check out some of the other sets on the market.
If you were indeed thinking of the classic koni yellow combo, I'd look more towards the Koni Coilovers, H&R's (Street Pref. or Premium Pref.) , or KW's (V1's or HPA SHS's). These are all just over $1k, sometimes cheaper.
And they are quality brands that have warranties and excellent ride qualities.
I know lots of people are reporting great experiences with the rokkors/racelands/ST's (KW)/8380's and the countless other budget options - and i am no one to argue with those reviews - but I wouldn't spend my own money on them.
FK's and K-sports try to be a little more performance oriented, but it think my suggestions are your swiss-army knife offerings.
Going to bump this, I already have koni yellows, but I am wondering about the ground control sleeves, is there any modification needed for the fronts? Like does the perch need to be cut off? Or do the sleeves just slide over like this picture I found in a BMW application?
ugh I feel dumb for posting that lol, I guess I was mostly looking for an example of how the perch looks like on the mk5/mk6 gti. I'll probably give them a call when I am ready, (Probably in another year...)
Going to bump this, I already have koni yellows, but I am wondering about the ground control sleeves, is there any modification needed for the fronts? Like does the perch need to be cut off? Or do the sleeves just slide over like this picture I found in a BMW application?
I'm debating between DG springs and a conversion kit like this with some 250-300lbish springs. I'd basically be a little firmer than DG springs, but with height adjustability.