Re: Fitch Catalyst anyone?
I mucked around with a very similar product about 10 years ago, still got one fitted to my ute.
I could never feel the difference, fuel consumption remained the same, engine idle is still the same. I really don't think there is any noticeable improvements.
The money would be better spent changing all your lubricants to full synthetics & using Premium Unleaded fuel. Those fuel catalysts are very expensive.