Don't worry about "stock"
You don't want these cars stock if you really drive the car. The stock MAP is flawed and can cause burnt valves.
My wagon has been off the stock MAP since it had 8000 miles on it and Cobb AP first came out for the car, Dec 04.
I went with a vf52 at 142,000 miles. The BNR set up is great too.
You should also remove the catted up pipe too, they have been known to come apart as the mileage get's high.
I also have both banjo filters removed in the wagon and run Amsoil 5w-40 European oil and their filters.
The oil return line has been known to crack and leak also.
201,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here