TurboXS RFL is loudest

Beef up the bottom end...and consider headstuds from ARP...or you will be watching your heads float like fairies.

a BOV has a flange. just weld an identical flange to your intake piping..any bov fits any application. it also has a line that runs to the intake manifold that lets out air while there is vacuum in the intake manifold. (your still pumping exhaust gas out, so the turbo is still spooling, it needs somewhere to go since the throttle blade is pretty much shut) and in an automatic, yes, itll only blow off when you let off the pedal and the throttle blade shuts.

some people will run dual BOV's if they are flowing alot of air, and 1 BOV isnt adequate to vent the excess air out.

PS...no they dont sound diff on a v8 or i4, they sound different in reference to how much air the turbos are pushing