Stock exhaust piping size

Anyone know the stock size of a 2011 4cyl exhaust piping? I wanna install a flowmaster myself but need to know the in/out size. Also any suggestions on what series I should get? I want something aggressive but not extremely loud sounding.

 

It's 2 3/8" outside diameter. When you buy a 2 1/4 inch muffler and have it installed, all the muffler guys have a hydraulic machine which expands the 2 1/4 ends just slightly larger for a good slip fit.

I put a Magnaflow on my truck...


...and after a week, took it back off because when I opened up the exhaust, I lost low end torque. The 2.7 stock exhaust diameter is exactly the same as the 4.0, so at low rpms where you need torque, it's plenty big enough. I didn't like the look of the stock pipe and so cut it off behind the rear axle so it's tucked out of the way.