M;
Neither have I, or anyone I've known.
That's what makes this hard seat business so stupid. It's the forced usage of the catilic converter (heat) that causes the damage.
Here is California the 'off road' places sell a "by pass" device that the hot Roders all use. They just replace their (unused) Cat. for the smog test & then go back.
On your adverage Jap car/truck it gives you 5-8 MPG improvement. So; If the Cat. helped the environment that wouldn't happen. The Cat. only helps remove HC/CO @ idle and engines weren't made to just idle.
If our 'public transportation' systems worked properly there wouldn't be highways turned into parking lots causing more smog.
Here the lead additive is called "octane booster" I think.
