I like Boost
I've been kicking this around for some time now and its coming down to decision time. I've heard some mixed comments and remarks about both products and I want to see what experience has to say on both ends.
I'm comparing KYB AGX inserts to Koni Yellow race inserts for the front of my car. (MR2 mod)
Some say they cannot be compared, others say it depends on what your going to use the car for. But Wes stated it the best so far:
It depends if you think the best is worth double. AGX are good, and durable, the adjustment range of AGX is more narrow than Koni. IF you are racing and want to win go Koni, if you are driving on the street and just want great handling go AGX, you will never know the difference on the street.
With that being said I'll start with the AGX. I've read a couple of autocross guys talking about this in various threads and they generally say that for the track the AGX isn't up to the task.
Rumor: They weaken over time and you end up bumping up to the next setting to retain stiffness. Is this something more than one person has experienced?
- 4 way adjustable externally
- They are offered at a very reasonable price. (~120$ each)
- Guaranteed for life (they say) does anyone have experience with the warranty?
- Great for street applications
But - how good are they for the guys who want to go back and forth from the track, guys that DD their cars and race on weekends?
Koni Race inserts
Regular Koni yellows
I dont know as much about these struts but from what I've been reading this is what I have learned.
- Externally adjustable
- NOT guaranteed for life (but the standard yellows are)
- (~220$ each)
- More range of adjustability than AGX
- Can withstand hard track use
One of my friends asked me if they were for on or offroad use. He brought up a point, he said if it was intented for track use only they might not stand up the harshness of shitty roads and potholes, that it might mess up the dampening. Is this possible? Should they really only be used for on track applications?
Bottom line: Price vs. durability and performance.
Most of us are budget builders who drive our cars on the street, but often we want to have that little extra to take to the track. Is KYB AGX the best solution? Or are the more expensive Konis the way to go?
For everyones reference if they want to recommend something for my car personally I'm running ground control front coilover sleeves (500 lbs spring rate), I have poly bushings, front strut bar and am shopping for camber plates. I also have addco sway bars to be installed. I'm going to mod my strut housings to fit an MR2 strut insert.
The rear I was planning on using the focus AGX shock, I'm running 400 lbs springs.