Get the header it It will make some difference if you have the other standard bolt ons like an exhaust and CAI. Either that or we have all just been wasting our money on this bolt on stuff when the only real way to make power is a swap. If money is a concern I'm sure you'll find a used one at www.thepartstrader.com I've been told most all d series headers will work on our engine they just need minor modification to your exhaust to fit to because of the different lengths.