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Riser for PCM exhaust manifolds – 3.0 inch. Generally used on all PCM exhaust manifolds prior to 1991. The 3.5 inch exhaust is used on High Output (HO) engines such as all GT-40 engines and engines labeled High Output (HO) from 1991 on.
Please verify if you have a 3″ or a 3.5 inch exhaust. Note: the manifolds are the same for either size riser.
The 3.5 inch riser is part no. R029011.