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By far, 20 mm front and 15 mm rear are the most popular choice. I am 20 mm all around Eibach spacers. On stock height, they work perfectly and make the stance very aggressive. I wanted that "don't mess with me" look and I think I got it. However, you can't go wrong with 15 mm rear and 20 mm front especially if you plan on lowering the car. Eibachs or H&R are the only worthy options because of their quality. I am not going to touch the suspension at all other than stiffer control arm bushings.
Got ya, I have a weird driveway/curb and don’t want any rubbing so prob go 20F 15R. Who’s the best vendor to buy them from?
What do you think they weigh?
I bought it from a local online vendor. I live north of the border so shipping, duties etc. make it more feasible to buy locally. You can reach out to Josh@Meraki and he can give you quote for them. I personally love the Eibachs. Great quality. They weigh around 1.5 - 2 lbs each, but you need to remember it is near the axis of rotation. Really closest to the center of the hub so the weight makes a negligible difference as the farther the weight is from the axis of rotation, the more amplified the effect will be due to inertia. Near the center, it would make no noticeable diffference at least from my perspective.
I agree with 15mm spacers in the rear because if you ever lower the car with 20mm spacers your tires will rub. I have 15mm spacers on Swift springs and also adjustable camber arms to square up the wheels: the tires just barely clear with only a few mm to spare.
I went with 15mm all around. Generally people also recommend putting a 20mm on the front. I'm in Swift springs and still had to bend a tab to stop fender liner rubbing.
I'd personally recommend the slip on style with longer studs. They're pretty easy to install on this car, and using a Lisle wheel stud installer with an open ended lug nut made the task cake. You can buy bolt on style spacers, but with the weight and performance of this car, I'd rather go with the safer option.