You still need to match up the exhaust ports for the 61x Factory pipe manifolds. Grind up the roof on the manifold and grind the floor on the lamey cylinder to match the bad casting on the Factory Pipe manifold because they always have them cast too low! Plus port match up a gasket.
The bolt pattern uses 8mm 61x bolts but the roof of the port in the Lamey cylinder are a bit higher like a 62T port, cast and the new billet are the SAME... Rats!, I wished they would have fixed that on the new billet! Just cost me time to make it right!