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Join Date: Aug 2010
Posts: 14
Any benefits of running taller velocity stacks/air horns on my 69S MFI?

I have a rebuilt 69S motor and currently going through the MFI system.

The 69S stack openings are huge (largest of the 69-73 MFI variants) at 46mm. It currently has the original plastic air horns which I won't use. It's old plastic that's fragile.

The car is going to be a weekend toy. Likely will have individual mesh filters and fiberglass rain hats.

Curious if there is any benefit to taller or shorter air horns since I need a set.

Thanks.
Old 12-17-2025, 06:12 PM
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