they rent there unit off my boss, they have just built a proper room around the dyno now with the 2 fans fitted in the wall. theres nothing better than hearing their tuned motors on the rolling road while im working in the yard next door dougs white b5 s4 widebody is stunning and packs 700ps , its breathtaking mate.id love an s4 but money is too tight so will have to stick with my bmw for now.