Out of interst the other cars tested were an XR3i and an E36 325i (24 valve)
The XR3i should have had 105bhp ( actual was 118.5 bhp and 131 lb ft of torque)
Superchip added 1bhp and 1.7lb ft
Starchip wasn't ready in time
The 325i shoudl have been 192bhp ( actual 178bhp 177lbft )
Superchip added 13bhp & 8.7 lb ft
Starchip added 10 bhp & 6 lb ft
So it looks like the BMW benefitted the most.
Factor in the BMW weight and you could frighten a std 325i with a GTE 16v!!