the alukitty was my first kit and the parmakit was my second kit..i learned a lot more math about porting and flow before i ported the parma..i gps'd over fifty with me alukit and my parmakit blasts my old alukitty.....absolutly blasts me old kit...i don't have a gps'd speed yet but imo the parmakit is better... as tommy said you have two extra transfer ports, a longer boost port and the exhaust port and transfer ports start bigger than the alukit..the intake is way bigger too... both of the kits were and are on an e50..long story short, the parmakit is worth the extra loot just know what you are doin...