I tried both last month, and bought the Remus. it's excellent. I tried the RPI first for a whole day and it drove me nuts-- waaay to loud inside the car at freeway speeds. I could not talk to my passenger without shouting, and I could not use the speakerphone at all. I had the RPI removed and installed the Remus. It's got great tone with just a bit more volume vs the stock exhuast. After about an hour of driving the Remus warms up and gets a bit more growl. It's just sweet.
And you're right, it's damn hard to record an exhaust well.
Hope that helps!
RC
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