here's a little bit of info, it might not help any, but just want to share it , i ordered the matrix coilovers from James , then went to the local speed shop and told them what i bought, they immeadiatly said they werent worth it , a lot of people with different rides just came back to complain about matrix's , and he wasn't trying to sell me something more expensive , cuz the shop owner mostly sells import parts, not any cougar stuff, he said the best thing to go with is the GC. so the next day i called CC to switch my order to GC. most shops will not warranty matrix installations. just something to think about.