according 2 info on this site the d16 y5 makes abt 115 peak hp in stock form. how much of an increase in hp should it get with a y8 intake manifold on it. my reason 2 ask is that here in pakistan the 96-2000 vtec civics were offered with a d16y6 which was the first efi n vtec civic offered from factory. it shares the same block n head as the y5 but has the y8 intake n exhaust manifold n a y8 tranny. the code on the ecu is p6F which i beleive operates in a closed loop circuit since these cars r not eqipped with o2 sensors. lastly if i swap this head with a d15z7 head ( jdm obd2 d15b dual vtec solenoids n a similar cam DESIGN like the y8 ) will it operate properly or i would have 2 change the ecu 2 the relevant code as well. if im not wrong this would be a similar mini me like the y5 block n y8 head. any feedback would be greatly appreciated, thanx.