This is boring shit about cars. I have a Honda and Miata. Both had check engine lights on and mechanic tells me need new Catalytic converters. I research online and find a forum about mostly Miata CATs.

They suggest buying Berrymans B12. So I ordered 2 was only $3ea but took weeks to get here. Immediately Honda check engine light is off. That's good, but Miata has issue starting so I can be 100 mi. from home when it pulls this crap on me.

The first can didn't do much but turn out the check engine light so I bought Berryman's 60 for high maintenance cars that never had a cleaning. Well get on highway car will only get up to 40mph. I pull off highway at scenic thingy and put it in neutral revving the engine, get back on highway flies like race car. They say it needs to be driven 150 miles to get thru the Berryman's so I took it out today and started with hesitation but started, drove to shopping, started right up, stopped to save a deer on highway ramp and started again. NO more problems with either. Miata has $700 converter. Do not need. So if you ever are told about needing new CAT just use the Berryman's. You are very welcome!