Recent content by Prince1984

Its a small car, toyota yaris/vitz. some info I get mentioned that perhaps the exhaust ports were ported relatively smaller than the intake ports, causing the resistance (or back pressure?) especially easily noted in the higher rpm when air flows more and faster. Any thoughts? Also, it is...

Hello all, After porting work, the performance of my car drops except in the low 2200 rpm or lower. Above that mark, torque dan hp drops. In fact, in the rpm 4500-5000, they drop significantly (proved by dyno tests) No other mods I use except the knn air filter panel. If it is because...