hi i am getting the milltek de restricted flexi pipe and de-cat pipe and i was going to get the milltek cat-back aswell but now i have come across the blue-flame cat-back and was woundering what peoples thoughts and veiws where on both. i like the raspy sound off the milltek and is the blue flame louder and is it a different sound? i also like the blue flame bacause it comes in 4 inch but is milltek better thanks