you will be happy with the 3815 as long as you donnt expect a miracle. i think that is the problem alot of times. people think that just putting a programmer in is gonna make them have a race truck,which is not the case.its a combination of different things that really make your truck come alive. i mean, you will feel some decent power from the 3815, but just donnt think thats its gonna go out and keep up with mustangs or out pull a cummins.