Brought my Skyline 4 weeks ago. Was stock standard but now has:
K&N Pod filter
Jasma cat back exhaust
Split dump and front pipe
Ball type boost control valve
Had its first dyno run this morning in 14 degree weather and made 178 rwkw.
Boost was set to 12 psi and my dyno chart doesnt show any of these dips in the power. The torque is also quite flat.
The mixture was VERY rich though, and the tuner said there was another 20kw to be found by leaning it out in the upper RPM.
Looking at upgrading to a front mount intercooler next but still trying to find an aftermarket one that has the GTR style end tanks, not the ones that look like only the bottom 3 rows are being used.