i gotta 88 gt ... what size throttle body does it come with stock? 65mm?

 

i think a 55 or 60 mm but not sure.

 

60 I think

 

stock is 59 mm on a 88 GT, next size up is a 65 mm.

 

I dont know how much meats on a stock one but check with one of the members "JEEP" hes got a little operation going where hes boring them out.

May be worth checking out im sure he can get you a little bigger for much less.

Ask him.