I would like to share with you guys my experience with larger TB, i have a C32 eurocharged tuned, 180mm pulley,psk, HE, meziere pump, in trunk reservoir, full sl55 intake with k&n, EC long tube headers, no cats..., recently i installed 80mm TB, machined down the sc inlet from 74mm to 80mm, 80mm y pipe, what i got is a large amount of torque below 3000 rpm and yes it shift faster from first to second to third like Woody said but on the dyno i got the same hp and torque numbers from 3000 to 6000 rpm even 5 to 6 hp down.