pablok

2007 Audi RS4 B7- carbon cleaned, has 190 000 on the clock. Can still hit 250 km's per hour, but as soon as i go over 3000 rpm, its like the exchaust has a new sound... a ****ty sound, like a toyota hilux diesel bakkie... truely is hideos... obviously there is also a tremendous loss in power. any ideas? Please help !!!

Pablo - korkiezp@gmail.com or skype: pablo3512