Seems to happen often with a h/duty clutch. Something you can do to strengthen the pedal assembly is to add an S-brace. We sort of discussed it in the coupe forum whilst talking about auto to manual conversions and when I utilised the S-brace it worked a treat and stiffens it right up :lol: you can read up on it here: http://evocoupe.net/forum/viewtopic.php?t=2838
replace it with a evo pedal box and u shouldnt have any dramas, i was advised that by Meek, cause i cracked mine too, have had it on for 6 months now and no probs