Originally Posted by fireresq157
That's great but basically this is just performance changes that are done at the dealership. For the most part COPOS and Yenkos major work were all done at the factory.So this is nothing new just more parts on the GM catalog. The thing with this is you have to pay for an extra engine and the engine swap. I think you would be better off splurging for the upcoming Z and you would still save money that you could upgrade other performance parts or bank.
COPO's....Yes, done at the factory! (RPO 9561 & 9563)
Yenko's....No, done at Yenko Chevrolet (a dealership upgrade, just like these).