Good luck with your Goal Of 600 man, it takes a lot of money and you will never make that with the ROM tune you will max out your MAF and have problems trying to run it above 500 as it will break up and cause things to break you need to go AEM, This is Paul by the way which my SR still makes over 600 since built three years ago but am considering selling it since i havent driven it in over a year but may cruise out soon