I know that a few members have the Roush SIDO rear exit exhaust system on there Supercrews with 6.5 ft beds. Just curious what modifications, if any had to be made to get it to fit as the Roush site states the following:

Works with 4x2, 4x4 vehicles with 4.6L and 5.4L engine SuperCabs with a 6.5' box or SuperCrew Cabs with a 5.5' box.

http://store.roushperformance.com/detail.aspx?ID=557

Also, anyone with the Legal system installed, how loud is it compared to stock?

Thanks.