Engine & Internal - Building an 03 Coupe??

what is the most effective mod to an 03 coupe but at the same time not going to break the bank... i already have an AEM intake and a MSD ignition i relally dont know where to go from here... helo would be appreciated

turbo but other than that not much D17's suck hard and even with turbo thats a costly investment. I was thinking about turboing my 01 but i decided to just save up for a new engine instead