Hello everyone i got a problem with my 1991 S13 after instaling Stage 2 (Horsham) . For the chip i installed this stuff : 1. New turbo pipes (60mm) 2. new Air Filter (K&N RU-2820) with 127mm diameter ,and 76mm exit to the turbo. 3. New T2860RS (hybrid) (Model 739548-5) : -Wheel: 53.90 mm -Trim: 76 -A/R: 0.86 -stock gate (7 PSI Internal Wastegate) 4. Manual boost controller (Turbosmart Tee Boost) for making 1.0 bar (around 15 PSI). So now on the problem. My car is running nice and seems to be fine but i got boost a wayyy later than expected . I heard that 1bar on that turbo will come around 3300 - 3700 RPM even with the bigger 0.86 A/R on stage 2 cars , but mine hit 1 bar way over 4500 RPM on most of the gears , on 4th its even past 5000 RPM . The turbo is can be heard from 2500RPM and the car start to feel alive a little but till 3600 RPM i dont have more than 0.1 bar reading on the boost meter. On other hand i need to unscrew the boost controller alot to gain 1 bar , and even without the wastegate vacuum unplugged i cant read more than 1.0 bar of boost. I measure boost of the intake manifold (http://www.driftopia.com/images/uppermanifoldvacuumsmall.jpg with Number #3 on the pic) . The other noticable issue is that i hear strange noise from the turbo on low RPM (before boost) then it disappears, and its kind of like bearing rattling but the turbo is new and it was in perfect condition even after i head the sound and took it off to check the fins. Here is some video of the sound (ignore the fucked up gasket noise) Here are some 3rd gear pulls to see the problem (one with 0.5 bar , and another with 1.0bar): - 1.0 bar. - 0.5 bar.