RX-7 Pilot ,
They were free! Well they were on the car when I bought it so I didn't have to fork over the $850 each they seem to be going for now. Some people have mentioned that there was a deal a few years back where they could be had for $550 each. I love them but I am too budget concious to have bought them if it were my money.
-Jedon

Hello,
The stock 850 cc/min have the red tops, and the stock 550 cc/min have purple tops. At least this is what I found on my 93.

Regards,
Brian