Eric,
yeah its like your car, but the end covers are yellow actually, sorry forgot to mention that, but it can be painted.
pm me with an offer for the cash adjustment, but i prefer to sell
well it has a stock wastegate. well you can but you need to probably run an exhaust and pod to make the full potential of the turbo.
again its upto you to put extra mods to get more power (injectors, ecu, fuel pump, boost controller)
well you can put it on either rb20 or rb25
and the 2530 is the least laggy out if the hks gt series
nothing it just bolts straight on.
I think the power increase depends on the boost and your other mods. do a search for hks 2530 and there was a graph that showed the power increase