Hey guys, I've been having a sputtering problem with my 240SX. I have an S13 SR20. Its pretty much stock with FMIC, HKS BOV, HKS wastegate actuator, 255LPH fuel pump, Blitz reflashed ECU, and Apex'i SAFC-II. I'm also running at 15Lbs of boost. It use to start to sputter between 4500-5000 RPMs at full throttle, now its between 3000-3500, so its getting worse. In neutral, it'll only rev up to 5000 at full throttle. On the other hand on partial throttle....seems to be less than 20% throttle, it drives fine. I can drive all the way up to red line and rev it up in neutral. when it sputters the Boost varies between 10-13, I haven't seen it hit 15 during sputtering. I checked all the couplers and what not to see if its a boost leak, but everything looks tight. Timing is good and TPS seems good(only looking through the SAFC-II) anyone have any ideas?