I may here people like you say one thing but then I may talk 2 someone else and they say something completly different. So I take it you have run both turbos joe or are a vendor? Im not trying to get under anyones skin. I just want the better turbo if there is a big enough difference. If the 530 will give me an extra 15 horses it may be worth it. I have done plenty of searching on this just trying to be active in this topic while its open and this gentleman seems like he is looking for exactly the same thing I am. Thanks MIKE