They have to be drone free as well. Fastfit exhausts, usually Bosal or similar crap drone. Can't be doing with it.
I have to disagree with the droning comments of Bosal exhausts based on my own experiences with them. I have fitted several Bosal pieces on 3.2's from the cats back with no problems at all. I found they were an excellent fit, heavier gauge steel compared with other makes available at the time, and the nice sound from them was comparable to the distinct V6 note from the original Vauxhall systems fitted on manufacture. Certainly didn't drone or sound tinny.
I was so pleased with the first Bosal system I fitted on my Omega, I later bought several extra pieces 'for stock' from the Bosal factory in Preston about 3 or 4 years ago when they were selling systems off when there was talk that the factory was going to close.
I am perfectly happy with them.