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https://shocktherapyst.com/dual-rate-spring-kit-drs-2015-2017-polaris-xp-turbo-4-seat/
No, I believe level 4 is just shocks as well which include both upper and lowers opposed to uppers only on level 3. I guess I’m asking is there any major differences. I have a full radius cage, a spare to the rear of cage, and some misc cargo weight. Would like to attack terrain at times and not as hard with family. It appears shock therapy comes with a crossover ring that claims to help both shocks work better together.
The crossover controls the transfer to the stiffer spring.. I thought the Eibach kit came with the rings as well. It is in the parts list in the directions.