Just thought I'd add my data point, since I found it interesting...

My '85 wagon was crashed into back in March, so it was down for a couple months while I waited on the insurance company and then rebuilt the front end. One of the things I added while doing the other work was this performance spring. So unfortunately I didn't get to experience the instant performance upgrade, made worse by having to iron out a few kinks in the engine.

One of the kinks was a nearly complete lack of boost, which I feared was a cooked turbo or internal damage due to the oil cooler breaking in the crash (only lost about a cup of oil though). So basically I was driving around with no boost unless I really stomped on it, and I have to say the car was still completely drivable thanks to this spring. The car was pretty sluggish off-boost before (probably somewhat due to living at an elevation higher than Denver), so I could tell the difference right there.

The good news is that the boost problem turned out to be a split in the line from the manifold. Easy fix and now it really gets up during acceleration.

Totally worth it.

-Rog

I'll tell you what mine does at the track when we get back there in late September. It'll be a little hard to know as I'm making several changes at the same time but I think the spring will be the biggest HP maker.

Dan