i can vouch for the red tops really strong engines when u have a good 1 that is my m8 had 1 a while back and it made 160bhp standerd apart from a good service totally wickid top ends his was pumpin out well past 150mph in his cav the pin was bouncing of the bottem of the dial so i can only imagine what that engine would have bin like in a corsa b ither way it would have bin a mental combonation