hello everyone, I too have the same problem, the best thing for the 530 is a super charger, like the one from ActiveAutoWerks they have for the 330, but they dont have the mounting hardware for the 5 series, i did a chip and exhaust, took the speed limiter out and increse the redline to 7000rpm runs good does 155mph,but it still needs a little more TQ i am going to look into head work and see how it runs after