Thanks guys, thanks Ian. The pops+burbles are mostly from the PE; there seem to be more pops with the DP in now and they're louder too.
I have an Olympus E-PL1 camera (micro 4/3) and this mic accessory:
https://us.buyolympus.com/external-m...tent=addtocart
I clipped it to the sunroof shade and shut the shade as much as possible, worked great, very little air moving up there.
Once you start moving you just want to keep laying into the gas, the sound is just so intoxicating.