Go to www.europipe.be and read all about it. Mine is the new EP1 which comes with the old EP1 sound level and EP2 power... The sound level is barely higher than stock and at idle and noemal driving and a nice growl at WOT just as it should be. About the knowledge...thank you but its y obligation to know pretty much all about it. I'm an Automotive Engineer and worked for a BMW racing team in England and had a great teacher (Teofilo Tuna) which is a track engineer for many people including Ni Amorim @ DTM, I raced cars both in England and in Portugal but most of all spent dozens of hours searching for other people experiences with this cars and jump my own conclusions...

P.S an Europipe review is comin' up real soon...