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Old 06-24-2012, 04:24 PM   #1
Scooby Newbie
Member Sales Rating: (4)
Member#: 311324
Join Date: Feb 2012
Chapter/Region: MAIC
Default KDT910 Whiteline Subframe Bushing Inserts on 2012 STI

So I finally, after a long wait (KDT910 was backordered) got my subframe bushing inserts on Friday, and installed yesterday. I think this guy's review covers a lot of it, but I know some people won't connect the Whitelines with the PowerFlex:


The Whitelines seem to look indentical except they are yellow instead of purple. I did the Perrin inserts on my old WRX and they were awesome. These...eh.

The install: No where near as easy as the Perrin inserts. The Perrin inserts are little donuts that sit in the big void in the factory bushings, but do nothing for the little voids. The Whitelines have these long fingers that fill all the voids...but also make the whole insert 4 times longer. I pretty much had to remove the entire subframe (supported by a jack) to lower the subframe far enough to get the inserts over the top. The good part is that they slide right in (unlike the Whiteline differental inserts that are a PAIN to install).

The product: They are nicely made, and definitely provide more contact around the factory bushings than the Perrin donuts...however I doubt there is that big of a difference.

The result: I kind of expected it, but you aren't going to feel these unless you are REALLY pushing your car. I am going to give it the highway and on/off ramp test tomorrow, but for the most part the back end is bumpier, and there is a little more NVH...noise and harshness, mostly on bumps. The new factory bushings they started using in 2011 are way better than the earlier ones. The inserts were worth doing for fun, but it isn't a night and day difference like it was on the 2010 and earlier WRXs and STIs. The one thing I do like better than going with the Perrin inserts is at least all the rear inserts match this time. I never really liked having the red subframe and yellow differential inserts. All yellow definitely looks better.
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Old 06-25-2012, 04:01 PM   #2
Scooby Newbie
Member Sales Rating: (4)
Member#: 311324
Join Date: Feb 2012
Chapter/Region: MAIC

Just wanted to post an update after the commute. I feel a lot better about the inserts today. I didn't really get to feel the reduction in driveline slop until I was on the highway today. Also noticed a slight difference in body roll, which would make sense since it both reinforces the subframe bushing and the rear sway connection points. I will definitely upgrade my review from a "not really necessary" to "slight improvement you might as well do if you already replaced/upgraded every other bushing."

FYI; already have Kartboy Pitch, Group N transmission and crossmember bushings, differential inserts, and aluminum carrier bushings, so this was the last bit of the driveline to upgrade.
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