I got the same foaming when the fluid level was low (caused by a leaking rack) - although perhaps it was also caused by sucking in air?? I got quoted $700AU for a new rack installed by Pedders, so instead I put in a bottle of Lucas' Power Steering Stop Leak which surprisingly stopped the groaning an...

Nice job. Is there a way to do this modification without already owning the CD changer? Any accessories/adapters to go from the HU CD changer port to 1/8th stereo? I'm with sjlevine on this, what's available to connect a 3.5mm jack to CD changer input... or can I build it myself? Thanks Switchblade