I got a new GoPro mount for my car so I decided to test it out. I did a muffler and resonator delete a few months ago and I think that the sound is perfect now. Stock downpipe and just a straight pipe back. Not too loud but definitely loud enough. Its a 2010 so it has the N14 which sadly, does not pop and burble like the N18 does in sport mode :( Still sounds awesome though! Heres the video

 

Your stock downpipe is preventing the pop and burble. N14s pop and burble just fine.

 

It still doesn't backfire like the n18 in sport mode or the r53, but a catless downpipe would be awesome. I would get one but I live in California and I don't want to risk anything with all of the pig cops around here.

 

 

I live in Cali and have catless exhaust and have not had a problem with the Popo. An evolve catless dp and Invidia q300 is nice quite on cruise and loud when your on it.

 

my general rule of thumb is that if the exhaust sounds clean and not like a little rice rocket, you dont need to worry about being pulled over, catless or not

also OP dont straight pipe your mini(and i mean a real straight pipe, you're not straight piped right now), dont add to the rice rocket rep mini coopers have already