Yes you can drive the car with a open DP
The flanges are turbo to DP, DP to Mid Pipe, Mid Pipe to Y pipe, Y pipe to mufflers. If I remember right.
208,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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