i think BenR got a K tech one and im not sure he was 100% happy with it but im not sure, also i dont think hill power dont make thier own anymore so it would be a magnex which i have got on the clio and its very good, but the best for power gains is that company that do mild steel ones, super sprint i think and they are the only people who test thier systems for performance increases, the are without number 1, just with i could remeber thier name, BenR knows who im on about