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 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.
H&R OE Sports. Only lowered .75 inch (or so). I love my Koni Yellows.
Finished the install today. Everything is perfect. Eibach prokit + koni Str.t shocks = perfection for NJ roads under $600. 26" ftg all around and ride is a great middle ground between coilovers and stock suspension. Rides like a stock gti. Which is exactly what I wanted. No floatiness, but you don't lose your fillings going over bumps. Very controlled and balanced ride. This is a fantastic pairing and you will not be disappointed.
At 100,000km I did Koni STR.T shocks, Eibach springs and a Progress rear sway bar. It's a riot to drive with decent tires now however I'm not overly impressed with the Konis, they don't have the best small-bump feel but the car feels ridiculously planted 100% of the time and stays flat through corners.
Running Koni FSD shocks and Eibach Pro-Kit, the Car is mostly used as a family car and wife, but wanted to stiffen things up a bit and close the gap in the wheel well area. Been running these for about 10 months and I LOVE the look, but the ride SUCKS!!! Its just way too bouncy for me and The amount of travel before the shock bottoms out seems like it is about 1\" (although I know it is more) and then you feel all that force through your body. It also seems very \"bouncy\", the ride in the passenger seats is even worse.
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