Also if it's new from CTS then is it worth asking them to do something about it, warranty maybe?
What power are you running or what's your spec as you were on the dyno and probably don't know? lol

If you want a decent but cheap box made up let me know, I have been building IB5's using 1.3Ka gear sets, RST LSD's and Escort Van non turbo casings and have yet to have one break (Famous last words) even on 300bhp Zetec turbo's.