- I haven't installed the Delrin in my car yet, but based on what Doug and Damon have testified to, there shouldn't be any real need to use an A-arm on top. The lower control arm design, if we retain that, is strong enough to control oscillation motion without an upper arm for support. I like this idea, keeping the heavy control arm down low and leaving the upper relatively light weight.
- I like the OE camber bushing. It is low friction and easy to obtain precise adjustment. I do feel that additional camber adjustment is needed on lowered cars. This could easily be achieved with a custom upper arm. A piece of curved chrome moly would be sweet here. It could have an adjusting nut in it for rough setting and then the OE bushing used for final setting. The CM arm could be very lightweight and an add-on for those who wish to spend the extra.
- I don't feel any need for bushings in the subframe mounts. I have welded those solid in the past and it does not cause noticeable NVH. Because the IRS subframe is currently bushing mounted, it has to have enough structural rigidity to retain shape under load without body support, and the body likewise cannot rely on the subframe for support. By making the IRS subframe solid to the car's frame you can greatly strengthen both. I think this is a BIG available benefit. Again, solid bushings do NOT result in noticeable increases in NVH.
- Rear sway bar mounts could obviously be strengthened.
- More room for exhaust routing would be a plus.
- Using the Cobra axles doesn't seem like much of a plus to me. As far as I know the outer hubs are the same as ours, they just have the 31 spline inners, and without changing the track of the rear there just isn't any way to use the axles themselves without stretching out the joints as Doug pointed out. I don't think the hub end of a Cobra axle is any different than ours.
- I'd like to see a provision for axle loops. I believe these are required on IRS cars in the 9's.