I currently have the 2.25 edelbrock Y pipe, I was wondering if I should put a 3 inch one on (they sell it seprate) I have a starght pipe in place of the cat which then hooks to the edelbrock 3 in cat back ( it is 2.5 where it bolts tot eh straight pipe/cat could it be adapted and if so how? thanks alot

P.S my mods are below the full exhaust was for the 305 lh4 motor now the car is running a 350.