[luke91]

I've argued this over and over with so many people.  

I have an S13 blacktop SR20 in my '91 fastback.  
I have the following basic mods:
front mount IC, 2 1/2" piping
3" downpipe and exhaust, no cat
stainless steel filter (oiled cotton=bad for MAFS's)
Blow off valve
boost controller (manual)
walbro in tank fuel  pump
6 puck clutch
aluminum crank pulley, no A/C, no power steering
gauges

I've boosted as high as 22 psi.  This was in fifth gear, about 4500 rpm's.  The boost spiked to 22psi, then slowly fell to 16psi.  
Normally, when driving full throttle, redlining all gears (when drag racing), The boost will spike to between 16-18psi, and fall to between 13-11psi.  The efficiency of the T25 turbo is really short, and while it will spike to high levels of boost (i've seen as high as 27psi.), it will only hold around 15psi before the motor outflows it.  I've never had any problems leaning out at these boost levels, either.  

I figure that with the modifications I have, I'll be putting down around 260 or 270 whp.  
Alright, flame on...