a 11.5x4 APC! sounds way too much, my leo will spin the 12.thingyx3.somenumberiforgot ok, but it dosnt like it, would be ok if i had a throttle pipe.
all i know is MY Leo on a 11x4 performs much better than the Irvine 39 on a 10x4, think he tried the 11x4 too, i was still better.
nothing wrong with the Irvine apart from the stupid colour tho. shouldn't have messed with the classic 36.
Wish Dean had let me know his Cougar was going with the Leo for 30 quid!