Well, a C4 isn't allowed in Trophy Stock if that's the class you're thinking of; but at any rate the C4 is heavier than the T5. As far as the computer goes, I know you can't run an stick computer with an AOD but I'm not sure if that holds true the other way around. I'll try to find out though.
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Jeff Chambers
T/S #4
12.028 Seconds/114.51 MPH
http://www.kellnet.com/chambers/default.htm