This thread is back from the dead...lol.
Anyway, I too have a question. If you use a shorty and a hi flow cat (or SVT race header with high flow), would the car pass emissions. Where I live, they don't use the OBDII port (I don't think), they actually analyze the exhaust coming out of the pipe with their own machines instead of trusting the ECU. Would a high flow cat still be able to pass?