Originally Posted by a.k.a
Originally Posted by Doug Stirling
The RS-500 exhaust manifold is sleeved down in size IIRC
thats the downpipe not the manifold =- all ford did was weld a washer in it to try to control the back pressure from the T4
AKA, I was only going by what I've read (see the edited post above)...........But if Pete RS Specialist says that manifolds are not sleeved, then I am inclined to believe him.