You get to pull to 6K rpm because you changed your cam. If not, you run out of breath around 5500 rpm. Change to stainless steel intercooler piping, you get much better response especially on warm afternoons.
And also, time for TD05 bro... hahaha... *poison*poison*
It been sometimes am missing from ZTH. I need to find aircond cleaner to clean my cooling coil. Yesterday open the cooling coil box and notice no filter attach. Damm.. I tought it should be standard issue...