If u get a 61mm or bigger turbo you might have lag like I did. The sweet spot on my yestertech precision SC61 was about 5500. That's when things got real, I only reved out to 8000 rpm on mine. I had tomei 270 pon cams. Peak power was at 8000 so I could have reved it out a little more.
https://flic.kr/p/Vf7c6b.