bc er series coilover set. this kit contains a full set of replacement suspension for a mitsi evo 7,8,9. the er series features canister type external reserviors with 2 way adjustable valving. thats right seperate bump 7 rebound suspension adjustments fexternal reservoir-- include pillowball top mount rexternal reservoir-- include pillowball top mount 30-level damping force adjustment external reservoir separate compression and rebound adjustment twin pistons design