Gary, the BOV Blow off valve is a valve that relieves intake pressure when on decelleration the boost goes to vacum. That leaves pressure in the intake. The GT uses what it calls a SURGE valve. That is basically a BOV, but uses an internal passage and valve to vent the pressure back into the inlet side of the turbocharger. You do not hear the turbulance that causes in the turbpocharger because of all of the silencers in the intake. Two removables in the air box, and one (Not Removable) in the up piping between the air box and the turbocharger inlet. If you were to change to an aftermarket turbo up intake system, (without a silencer), you would hear the turbulence in the turbocharger upon decelleration. To describe it best I'll quote TurbomanGT " sounds like a handful of change in a blender". Mopar makes a kit that converts the surge valve into a Blow off valve. The blow off valve vents that pressure into the atmosphere rather than redirect it into the turbocharger input side.
You asked if you need it, I think you have to look at what it does and decide if it is important enough to you NOT to vent back into the turbocharger. I have heard the noise that the turbulance causes and it is not pretty. The BOV (any BOV) vents to the atmosphere and creates a pshhhh sound when it does.Some people like it some do not.
The general consensus is that the surge valve vents into the turbo intake and fights against the pressure on the output side of the turbocharger. This can cause impeller and/or bearing & shaft issues over time. The first mod that I did on my GT was an Air Raid aftermarket intake. This still used the original up piping (with the silencer)& I could hear the turbulence in the turbocharger. The next mod that I did was to order and install a HKS SSBOV and installation kit. I couldn't stand the noise the turbo would make without the bov (mainly cause it made me feel like i was damaging the turbocharger). The conversion kit is less expensive as the current surge valve is modified to vent into the atmosphere and only requires a modified cover (with vent slots) and some other parts. Listen to the opinions of others as well as mine here and you'll need to decide for yourself if you need it. Just because you can't hear the turbulence in the turbocharger on decelleration doesn't mean that its not there.
Alan [}
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