The Blueflame has a deeper tone, and between 2000 and 3000 rpm it is very very loud, all the car starts to vibrate, and in high rpm's is very quiet. The Milltek is exactly as i want, quieter and in higher rpm very beautiful. I haven't heard a Skoda Octavia RS with APR RSC. A friend of mine has one, but he's out of country right now :(