Which would be better to buy to gain hp. Get the XEDE or get the HKS EVC V set the boost to 22 psi. Then get the APEXI SAFC II and tune it? Thanks for any help.

 

First, you dont want to boost 22psi all the way to redline, unless you can monitor your knock.

You at LEAST should have some colder plugs to boost 1.5bar all day long. Its likely youl detonate on 22psi with regular gas and no tuning or hit fuel cut in 4th or 5th gear.

Buy an Xede. It does all this for you. Shiv has good maps with aggressive timing advancements and proper fueling to make your car run fast, safe, and strong as hell. The Xede has the capability to control boost, Shiv is just working out a CEL the wastegate gets with it.