At first glance, the Hemi engine in Mao Phoeun's 2010 Jeep Grand Cherokee SRT8 looks pretty much stock. There's a few extra fuel lines here and there, but wait, what's a blow-off valve doing in the ...

At first glance, the Hemi engine in Mao Phoeun's 2010 Jeep Grand Cherokee SRT8 looks pretty much stock. There's a few extra fuel lines here and there, but wait, what's a blow-off valve doing in the ...