I ordered it directly from BMR. They say it helps about 75% and I would have to agree. It is not the complete fix, but it does help. The kit isn't to hard to install. I put the car up on jack stands and changed it, but a hoist would have been nice. I have read were other guys have changed tires and they say that also helps. My car does not have the FG2 shocks, which I think would help, so I my have to buy a set and try them.
I went to DTE yesterday afternoon and drove my car. The Stainless Works headers and high flow cats along with DTE's dyno tune diffently brought the car to life. There is no drone at any speed and the sound with the Corsa is awsome. One big improvement in performance.