Hi guys,

Just purchased two remanufactured gen 4 420hp mercruisers I have trs drives with bw transmissions. Can you tell me what exahaust manifolds with pipes out the back would be best.

Thanks

Gil type manifolds flow good for that horsepower range and aren't very expensive if you can find some nice used ones.

There is a pair of seaward exhausts for a solid price in the swap shop if you want to go that route, I believe they are based on GIL design

I have 4 Gil/Merc risers 818498-A1 near perfect condition. Manifolds are around, new and used fairly reasonable.