Great transformation
As for the roll cage comments, a roll cage was the best handling modification that I carried out for the track along with the tyres and coilovers. Its also nice to know that if you ever rolled a tin can civic that the cage is there to hold the roof up!
On the track I also didnt notice any speed difference on the straights with my b16b and the weight of the roll cage against my friends b18c6 dc2 without a cage and rear seats etc removed