If you don't tow heavy and want to have some fun, the step 5's are the ticket. Make sure you have good FP before the install and you might as well go ahead and remove all restrictions from the inbound fuel line, personally, I wouldn't be without the Weber fittings in replacement of the banjo bolts. You are going to be way out of the limit of the HX35, if that's what you still have. I can hit 42 psi's of boost with relative ease in 4th gear. 5th and 6th gear can see 45 psi's, my wastegate setting, with no problem. That's with the EZ and the step 5's and the TST box OFF.
The 5's are on the fringe for me as a daily driver in the summer, mucho smoke when it's hot and humid. In the winter months they smoke less than the step 3's did in the summer, if that makes sense.
Scott W.