Increased compression, ecu tuning, better breathing intake and exhaust 150kws at the flywheel vs R33 gts which only has 96kws
And just cause the engine size is smaller it doesn't mean it has to be more powerful an gtr R34 has just as much power as a v12 90's Ferrari. If fitted a better exhaust and intake and a boost increase
My 4 cylinder 200sx has 200rwkws with a pod, intercooler, full exhaust and boost increase and my friends r33 with catback and increased boost only has 150rwkws