This is a how long is a piece of string question. Do have a goal power wise ? Budget ? Consideration for other bits, no point going quick if it doesn't stop or go around corners ? IMO opinion if you are on the hunt for more power it is best to save for all the hardware and get the lot fitted and tuned in one go. The piece meal approach will cost you more in the long run. due to re-tuning costs. A tune will give you a good increase however it will push the standard components if you take it to the edge. My advice is to speak to some tuners and get their feedback. First decide what you want the end point to be BTW PS do a search,heaps of treads on this topic, will help you make a decision/ pov