Will be getting the APR downpipe/HFC installed at the same time... allows me to run the test-pipe file... stay tuned ;)
Edit:
The APR downpipe/HFC in combination with the test pipe file is a great combo as the turbo spool up is practically instant (thanks to less back-pressure). There's plenty of power and that's how a Q5 should come from the factory ;) Unfortunately, I had to go back to stock cats (and non-test pipe file) as the Remus exhaust didn't play too well with the HFC since there's excessive drone in cruising RPMs. There's plenty of growl at idle but the lack of a "trunk" means the drone fills the entire cabin.
Going back to stock cats, the increased back-pressure has slowed turbo spool up (more like stock) but there's still plenty of power on tap in the upper RPM band. This keeps a lot of the luxury that the Q5 possesses. As the transmission is still learning the new power, only time will tell about the fuel mileage.
(images are courtesy of Dion @ Achtuning)
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