it is easy, 5 wire connection......you need the right chip for your application and it is pretty easy to tune (tuning capability is limitted)....great for a street car, the gcc's are usually pretty reasonable I have seen them as cheap as 75.00 and as high as 180.00 when they were popular. there are different models of the gcc, the newer ones are sometimes higher priced...vpc's can be had for around 300.00 with the sensors...you have to keep in mind they haven't made vpc's for a few years now, so you'll have to wait until you find one...they pop up now and again.....for a few bucks more you can get one with a plug and play harness...there are different models of the gcc, the newer ones are sometimes higher priced