i recently installed 2004 pi motor in my 97 gt works great will i need to use a programer to update electronic as i used orig electronic. added accufab t body cold air and h pipe. also what programers will let you upgrade injectors without mass air change also geared 373. thanx Roy

 

XCal2 will do everything you want. You will not need to change from the stock tune with the complete PI motor swap but a professional dyno tune will probably help your power delivery and drivability.