I got a Stage 3 chip. Added about 9rwkw and a lot of accelerartion but a mate did it and got like 1rwkw and no difference. Just depends which one you buy.
i have looked at a few of these chips, about all they do is add some extra timing into the maps.
you would be far better off to advance the distrubutor to 20deg (extra 5 deg) and run 95-98 octane.
effectively the same thing, but no extra cost involved.
its only an NA... not worth goin all out on... i have my timing at about or just under 20deg, full exhaust, always premium fuel... never pings.. goes not bad for an NA