thinkin exhaust next

hi again ive got some de cat pipes lined up of a mates 4.6 thats being brocken an he only wants £30 for em got the lamda sensors an evry thing.My question to the masses is the rest of the system looks new so what are peoples views on universal back boxes to release the v8 noise.Anyone tried these and if so what did it sound like

If ya change ur mind about the de cat pipes let me know... im after some

they are quite loud not used them on a range but used on a bmw bit to boy racer for me,prefer a custom mate one then you can tell them the noise you want.and they make it that way for you