There are some manufacturers offering ADR approved coilovers here in Australia. TEIN super streets were possibly the first, I imagine Pedders are approved too. From memory I had my HSDs mod-plated years ago. Pretty sure I still have the phone number of the engineer that plated pretty much everything on my car for me.

What diff do you guys run? I have a shimmed r200 in my 32. Was watching some GoPro footage from my last QR drive and I reckon it's holding me back from angle/speed due to the wheels not spinning at equal speeds. It's worked fine until recently. On turn 6 at QR for example, kicking the clutch in third does not push the rear out and let me use more steering. It seems to be struggling under the load. Traditional upgrade is a 1.5/2way. Decent used parts for all S/R chassis are hard to come across nowadays though. I'm tempted to just weld it up. Is there actually any benefit to a mechanical centre over welded? Keep in mind the car is track only. Cheers

This sounds like something you could suss with the age old stock ecu diagnostic mode! Should be a little screw on the side of the ecu to turn on diagnostic and a LED will flash in sequence for error codes.

I use the HC20 too. Great size to keep in the bay with cooler piping, no messing around with relocation cables etc. Definitely needs to be isolated. I've start using a jump pack on cold mornings to help with the extended e85 cranking before the old RB coughs into life haha

Get a modern ECU. Haltech/Link are widely known by tuners in QLD and some seem to have a preference between the two. The ease of expansion and broader tuning capabilities of both make for a safer and better tune for your motor. The resolution of the older ecus just doesn't cut the mustard anymore. Talk to Whitey about Links.