I never got the chance to hear @675430VME car with the jb4 but I can attest that the Mach 5 downpipe paired with his (I think is a custom) SS exhaust sounds extremely good for an i4. So much so that I also bought the downpipe.
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400HP US version. Power figures are at the wheels. Hub dyno. Supposedly a stingy dyno that.That's great! 400 hp US version?
At crank, right? Thank's for sharing!
JB4 just arrived. Gonna mount it this week. Already installed the MACH5 GPF off, sports cat. It was a PITA to remove the original one..