supracrowdis

I just bought my girlfriend a 2003 gt conv, I was wondering do I need a programmer like my 2006 gt for doing intake and exhast. And does anyone know what size pipe, exhaust piping I need to cut out 2 of the cats out of the stock mid pipe, I was thinking 2 1/4 inner diamiter. And being that her car is an auto whith 20' wheels would you guys install 3.73 gears or 4.10 gears. Thanks

Jexey

I'd say because it is your girl do 3.73 gears so she's not too overwhelmed and you don't need a programmer for intake and exhaust. If anything you need it for the gears!
I want to say the pipes are two and a half inch but don't quote me on that.