[benoit454]

I'm very happy with them, mine had duals and I didn't have a welder fo I didn't want to cut or weld anything, as for bolting thwem on not long. About as long as it'd take to remove the 3 lower bolts and the 6 upper bolts on each side, maybe a couple hours or so if that but mine had been off recently. If the manifolds aint been off might take a little longer. I removed all my plugs so I wouldn't drop one and break a plug, and that was the biggest PITA of the whole job putting the back 2 plugs in on either side. You need an offset 5/8 or short 5/8's socket made for plugs that let's you use a wrench on, but I got by with a regular box end 5/8 it just took some time.