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This is the PCM exhaust riser for 5.7 liter engines, Ford engines and GM 305/350. Its outlet is 3.5".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 3.0 inch riser is part no. R029001 and is generally used on PCM manifolds prior to 1991.