koveleski the maxbore is a great way to enlarge the the t/b for a very reasonable price. they enlarge the inner body approx 3 mm to 77 mm and builda nd install a new butterfly. gasket match and shipped in the us is 125$!!! turnaround time is 2 to 3 days.
im just waiting on tony to return to atlanta so i can retune on the dyno soon after its done.

as a comparison an oem t/b is 74mm. the maxbore gets you 77mm for 125$ and the 80 mm runs somewere north of 750$. so for 525$ you get 3 mm! my opinion is unless you are running the biggest mods available ie 185 or stacked meth or nitrous the 77 mm bore will be more than enough airflow for the c3 setup. again just my thoughts