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      05-16-2015, 04:15 PM   #2
jdoublehcubed
Mechanical Engineer
United_States
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Drives: 2006 Z4MR, Imola Red
Join Date: Jul 2012
Location: Anaheim, CA

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4 hours for all 4 springs sound extremely fair to me. For the fronts that entails pulling the suspension all the way off the car, so its quite a bit of work. I haven't done a suspension swap on this car yet, but in the past I've found around 6 hours is a reasonable estimate.

That said, there is really no need to replace the front springs in this case. The rear springs are widely known to fail, but the fronts are not. You should definitely replace the rear spring, and I would say do both springs at the same time, as the new one will behave slightly differently than the old one and could show up as unpredictable handling if you have both and old and a new spring on the car at the same time.

Whether or not it makes sense to replace the shocks at the same time is mostly dependent on mileage. People here frequently replace the stock suspension between 80k-100k miles, but I think there are also plenty of people who have gone longer than that.
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