Your air cleaner will flow all the air you'll ever need with this engine. The stock injection pump will probably be maxed out with whatever chip-tuning you purchase, and at that point the performance mod list pretty much ends, unless you consider adding a high-quality propane injection setup. In any case, you should install a pyrometer to monitor EGTs just to be sure what's going on in there. So long as you're using the stock turbo, there should be no need to modify the exhaust. There are lots of other mods you can undertake on this engine, but they're not even remotely off-the-shelf bolt-on.