A guy from work here has a 98 240sx with a KA-T and Unreal suspension. It is a time attack car. He built it with CP pistons, Cometic hg, ARP everything, custom top mount manifold, GT30r and the full AEM EMS system. At 18-20lbs of boost it put down about 430 but was kept at 14lbs dyno tuned at 356hp at the wheels on a mustang dyno. I have driven this car and can attest to the fact that it is stupid fast even on the low boost.
However, after much abuse the rods apparantly weakend. He was giving me a ride to an appointment I had and cruising at about 2800 rpm it died nothing loud though. We tore it apart and found the no.1 rod snapped and ripped through the girdle and block.
This weekend we put the new motor together with the new Carillo rods and new CP pistons. This time it has a ported head though . It should be wicked fast for another 8 months before it breaks again. were gonna finish it up this weekend and have fun all next week.