First of all I do not think you can complain about paying $90.00 for a bulkhead or for the Specialized RC parts. These parts are not from Corally and they have to be custom made and in limited numbers since the market for these is so small. I agree that $90.00 for a bulkhead sucks but come on, these are custom made in small batches and the quality is just as good as factory Corally stuff. For that alone, I think it's worth it!
It would be nice to see an upgrade kit but it gets confusing with a car like the RDX as there have been many varations of the car. As the parts have evolved, they have been included in the box as standard. So now the question becomes, what parts do you include in the upgrade kit? If you include parts in the upgrade kit that I already have, I am not going to buy the kit, thus reducing the amount of potential customers and thus increasing the price of the kit.
I already have the bulkhead, so I would be purchasing and upgrade kit if it is included.
You can argue that well what about the kit for those that just bought the car and have none of the hopups? I am pretty sure that most of the people out there that just dropped $450.00 on the car would have an issue paying another $200.00+ on top of that for an upgrade kit.
Now to have a truely US Carpet Spec car that includes the 4mm chassis, lowered roll center blocks and motor mount bulkhead, lowered shock towers...well I'd be game!!