Using lower/stiffer springs requires the use of stiffer shocks, or else handling, braking and comfort will be worse.
I have not heard of anyone that has upgraded the suspension of the Insight yet. It can be done but make sure you do it right the first time. Work with a good reputable shop that builds race cars so they can guide you with the options and do the installation.
For performance driving and racing linear springs are better then progressive springs.
Koni 8610 shock inserts should fit from the measurements i've made. But they will reduce the travel by causing the OEM springs to have about 50mm of preload more then normal. So that's why I decided not to upgrade the shocks while using the OEM springs. Since I auto-x in H-stock class we are allowed to upgrade the shocks but the springs must be OEM.
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2000 Insight 5spd with 290,000 Km
Daily driver (previously used for autoslalom & track lapping)
Collision avoidance and Track driving instructor
Hey man, my chebby looks great like that. but I had to install sprung seats to make it ride good. Only problem now is that I will have to add sprung steering wheel and pedals so they follow the seat....# Cool man. But does it improve the MPG???
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Jim Isbell
2000, 5 speed, 250,000 miles
"If you are not living on the edge, well then,
you are just taking up too much space."
I believe he is gently and humorously telling you the idea of lowering an Insight is not seriously entertained outside of certain ethnic neighborhoods.
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Driving on down the road in my 2001 CVT, going "Boogety Boogety" ...and until avatars are provided, my car looks just like the original silver Insight on the header, above... =)
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