take 1 standard gti-r , increase boost to 1 bar,add exhaust + filter and they can usually do the 1/4 in around 12.8 with a good lauch

here's some examples of gti-r's with just a few mods doing 12's

Time - 12.85 @ 106mph
Venue - Santa Pod GB, August 2002, USC
Weather - British but dry
Mods - 1 bar boost, exhaust, filter, organic clucth, dump valve, 17's, JIC Magic coilovers (don't budge [8D]) 260-280bhp

ET 12.7s@106mph
Venue York
Weather Not too bad thanks
Mods Bits'n'bobs but standard internals/turbo

12.94 @103.90 mph
0_60 1.700
weather was warm
standard clutch was slipping
mods were .9 bar full exhaust
pod filter

13 SEC DEAD @ YORKDRACWAY
RUNNING 1 BAR
EXHAUST&INDUCTION
SKYLINE PUMP
IRIDIUM PLUGS

12.87 Santa pod 2nd March running 1 bar

12.6@110mph
Standard engine and turbo 11 years old and 110k miles.
FMIC, fuel pump, mongoose, standard fueling, bleed valve holding16psi, oil cooler, ap organic clutch, 15inch wheels with remoulds!!
Crail airfield 17/8/03

12.85 @ 108 mph (1 BAR boost)
G-TECH
exhaust, filter, boost.
around 280hp probly.