I got the bumpsteer kit. Been driving with it for about a week with a different alignment spec. I'm only running 0.2 degrees total toe-in in the rear, stock is around 0.5, and the UK alignment is 0.4.

It basically reduces the amount the toe changes during rear suspension movement. (I think that the '04 cars have reduced the rear toe curve.) I've always found that the rear end wiggles with uneven bumps and suspected that excessive toe-in from high speed sweepers compressing the suspension causes the rear to step out before its time (i.e. not power oversteer).

The rear is more stable over bumps. It feels like there is a lot more rear end grip, since it is a lot harder to force power-oversteer. That might be the placebo effect though. I'll find out about the braking and high speed sweepers w/ R-compounds after the Watkin's Glen HPDE though

 

Yeah, let me know. I've been thinking of doing this, but want to have some realworld feedback first.

 

First learn how to drive your car stock

 

Yeah Jay, learn how to drive Marta's car stock for shit sakes.

Albert thumbs up for the excellent quantity of fluffy soft Kirkland toilet paper in the washroom.

Its JDM to the max