yea i agree, imo custom regrind would be the way forward, but let not forget 4efte and gen 1 4efe rev to 7.2k with the same cams so an extra 800rpm might not be that unrealistic, will help keep you right in the power band with a fte manifold. obvioulsly cams are needed to bring out the full potential. i have no experience with the rolla intake, but the fte intake adjusts the power band completly, im using just uprated filter with std airbox to maintain air velocity and matched with a 4-2-1 to aid tourqe, i feel with just another 1k revs the car will come to life as its still gaining good power till the limiter. (6.2k)