i know if they do superchage it , it will be a good job, i have seen how they do it, i have seen JMWeb there many times, i read this article at e46psi.
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Congratulations to JMWeb for becoming the First E46 M3 in North America to hit 500rwhp!
This would not have been possible without the help of the following project sponsors: Active Autowerke, Nitrous Express, Spark Plugs.com and UUC Motorwerks.
It's because of these dedicated companies that the S54's 500rwhp barrier no longer stands.
Keep a look out for a full release including dyno footage, quarter mile times and in car acceleration
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his car is just like mine(only different wheels)