HI, have a smaller Nispro intercooler fitted and it is holding the car back. on the couple of runs the temperature rises and power drops , plus maximum power on 109 is 489 KW at 5000 ( 22PSI ), and drops off before 55 to 6 due to heat and detonation. Motor should pull to 6000 I have been told the new Nispro will allow 600 RWKW , and am surprised at the size of it for that sort of power. There are others out there that are bigger and the same price ( about $1300 ) can someone help me on this 98 is not as bad but can only get 18 PSI before detonation( 402 RWK )