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Well on the compression NA could mean different ratios depending on what yr rotors you are using. I am using the 9.4:1 from a S3 13b, then you have the 9.4:1 S4 rotors which are slightly heavier then the S3 & S5 rotors & lastly the S5 rotors are 9.7:1. For the turbo rotors the are 8.5:1 for the early models & 9.0:1 for the later. Running higher compression does not mean failure, it means tuning has to be more spot on & the use of higher octanes. As for the blower measure the case in between the end plates (ribbed section) it will be 5" or 7". My set up has a water to air aftercooler for charge cooling, smallest blower pulley Camden offered, larger diameter main pulley, port matched the manifold & a bigger fuel system then most of what I seen guys running on the Camden. I do have an Aquamist water injection system, but it has been taken off & may not go back on.
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