Koni shocks are the best you can get without spending 3.5k on a set of racing coil-overs. I have them, yes they are that good
I'm running Koni STR.T's with FRPP K springs on my mustang and have been happy with them overall - still do wish I spent a little more on the adjustable's but for the price I can't really say anything bad.
I have Koni Red's on my Jetta, on the stock setting they come in they feel just a bit stiffer then the stock sport suspension that came on the car. I like them. After several years they are rusting a bit though.
Those Koni's rusted out quickly on an old integra I had. Seemed cheap out of the box. Have had several Bilstein setups. Never an issue.
The Koni STR.Ts I have started to rust at about one year old. It seems to happen a lot on them according to TDI club.
I don't know if it will be the same for the Mustang, but on my GTI I have Koni STrt shocks and they certainly are not OEM+, they are about as stiff as the Koni yellows on the 3rd click up from the softest, they make for a rough ride combined with stiffer springs like the H&R race springs I run. As far as how they have held up they have been on there for about and year including one Upstate New York winter and they still perform the same, They have begun to make a squeaking noise over harsh bumps and I've noticed a little seepage at the top but the housings have next to no rust, no complaints.
I have installed the shocks/springs for month and have decided to sell the vehicle due to new family member arriving soon. These transformed the car. Really nice set up. Smooth ride and handles really nice. Sticks to the highway very well.
I had FSD's with VWR springs on my 12 R and it was an excellent combination. Granted that was one of the worst riding cars I've ever owned stock, so the improvement was very noticeable. It handed better as well.
My Corrado has Koni yellow shocks at stock height and the rebound/stiffness is set right in the middle. It's a pain to adjust the rear stiffness, but somebody sells low profile knobs for them. The car is in storage so I don't remember if the rear spring perches are adjustable. I do remember that the car rides great and I can just adjust the stiffness in a few minutes (on the front anyway) if I want to corner flatter.
I bought a set of adjustable koni yellows with vogtland springs for my jetta for $40. No idea how old they are, but throw on the stiff setting and they rock corners pretty well.
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