The progress group set up seems to be a good for the money entry level coil over I have no complaints over my setup since progress group can built a set to whatever the specification you need, since I’m racing a 2250 pounds b13 the spring weigh on front is 375 and 250 rear anything heavier than that will send the sentra flying all over the place I remember when I first ordered mine the costumer service guy who actually help mike on the design of the coilover told me to use a weight of 450 at front and 350 rear but it was too much when I first tested the springs on the race track the car was just too tight and never came to have a good grip so I ordered some springs from eibach at 375 F and 250 R and problem solved ,I know there are many konis with adjustability than can give a lot better performance than what I have but for 1000 bucks for more than an average coilover I think its fair what progress offer to costumers.
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