I went the powertrix route because of Charles support and I’ve been happy with them but like most I don’t have anything to compare them against. The thing that turned me off to the V3’s were they don’t give the coil spring rate and then when I called and got someone to give me the rate they seemed rather soft compared to other options and then also they are progressive rate springs which I’m just not a fan of. I tested them in my buddies m3 (he likes em) and I know it is not apples to apples at all but it still had that unsure lean over in turns that I feel is largely due to the progressive spring since every car I’ve driven that has progressive springs has that same sensation. Also his make noise as well. An option that is now available that was not when I got mine is the Greddy coil overs which are using KW single adj. dampers but with linear springs. Otherwise the powertrix have held up well and I believe they are on a big sale again so great time to buy if your looking that route.
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