actually d series vtec stock heads are good for 400whp all day long. You could tear open a d16 throw in 150 vitara pistons a set of tuner toy rods or eagle and basic oem stuff and put down 400whp with ease with less then a grand in your motor. And it would be SAFE if tuned right! There's a shitload of d16's on H-T putting down over 400whp on stock sleeves with vitara pistons. 500whp range with cp's and je's on sotck sleeves.Originally Posted by blue_5g_zc