Hey Brad. I'm in Huntsville, so not far away. Sorry for the late response, work has pulled me out of state for a few weeks. My car currently has quite a few mods internally. With all of that, the stock ECU likes to pull timing and keep everything pretty rich. I wouldn't suggest my car as a fitting example for what to expect with the -5's. That being said, it really comes down to what you're looking for.Hey there goinsleeper. Someone told me I should look you up on here seeing as we are both from Alabama. I live in the Birmingham area and would love to meet up with you sometime. I would really like to see how those -5's feel. I currently have my car down because of a blown headgasket and am trying to decide what turbos I want to put back on the thing. Anyway awesome build man keep up the awesome work. If you want to look me up on facebook my name is Brad Finley and I have a pic of me wearing a tux and my KG1 GT-R is my background photo.
If you want better response, you could go with something smaller. If you're looking for 500hp at the wheels, while maintaining response, I would go with a single turbo. I actually plan to go single turbo in the next year or so, though that timeline isn't well thought out. The wife and I are shopping for a house, but it might be 6 months before we find what we're looking for. We're not in a rush. Depending on how that goes, and how quickly I can get my shop, the timeline may get stretched.
If I upgrade my fuel pump, injectors, and switch to e85 with a proEFI, my current setup should be good for 475hp with some response or 550'ish leaning toward a heavier top end.
I'll look you up on facebook, though I don't use it very often. Until you can PM on the forum, that would likely be a better form of communication.