[JLMounce]

Only my opinion of course, but I basically never recommend poly urethane bushings in suspension components for a couple of reasons.

1. They can squeak (not always, but it is possible and there's a lot of evidence around this)
2. The material is used to make bouncy balls. You don't actually want your suspension reacting in this way

In my eyes there are two products to use. If you are very concerned with NVH first and handling second, you choose a quality rubber bushing like the factory would have used. If you are less concerned about NVH, go straight to a delrin bushing.

The allure of the poly stuff is that it's cheap and is a "middle ground" between the two, but honestly it just sucks in both categories comparatively. First, the reason those bushings are cheap is because at scale, the cost of poly urethane is nearly free. That is the MAIN reason why companies use it, bottom line. Secondly, the poly bushing does have a tendency to transmit more road feel through the suspension than a rubber bushing will, but doesn't do nearly as good of a job with deflection as a delrin bushing does, so it's just kind of a compromise everywhere.

In regards to NVH, it's been my experience that quality delrin bushing sets either found in good quality aftermarket control arms, or as part of a good rebuild set for the factory arms have enough of the delrin material that transfer of NVH is minimal to non-existant. It's when you get mostly a bushing sleeve with a very tiny delrin bushing where you start to see issues. Most of the people that comment in regards to NVH with solid bushings typically haven't ever driven a car with solids, or they purchased the cheapest set of ebay arms possible with terrible bushings in them and use that as a reason to blanket the statement that they are harsh and noisy.

My car has been on solid front suspension bushings and solid body mounts for going on 10 years now. I just put leaf springs in the back that have spherical bearings instead of bushings. My car doesn't transmit a lot of the road to the driver. In fact it's annoyances are all parts in the passenger cabin, like a squeeking sail panel.

If you're thinking about rebuilding the factory arms along with your steering upgrade, I really like adding the delrin bushings. I personally would either use the Ridetech rebuild kit, or the Global West rebuild kit.