Deon what exhaust do you run? How much should the squish be?

I thought my pipes were modified '89 RS, but based on Matt and Stephens experience with lack of middle, I cannot say for sure, mine has HEAPS of mid. They are labeled HRC and they are much fatter than NSR pipes. As far as the squish goes, I wont say that what I am running is good for anyone else. Most would say it's too little, but then the bike is only used for a short circuit (go kart) track and there is no over-rev at all. 73 HP at 10600 rpm. I think I can get more if I can get the bike to rev more, but believe me 73HP is quite wild for a 250.