FWIW I just switched from my 40 series which i eventually learned to hate from the stupid drone and constant headache it gave me to a Pypes performance M-80 straight through built pretty much like a magnaflow but with a slightly more attractuive price

....I LOVE IT!! i've actually tried to recrank my truck once as soon as I got it put on cuz at idle its al most silent but as soon as you get on it it sounds awesome!!