we made our own and tested and marketed the product it works with giving you say 30 secs more run time and that depends on alot of factors outside temp and more .
Anyone who says 1 minute and beyond is living in lala land it's all bull .To get more that 1 miute you would need a cooler biggeer than the fuel tank ,fioroni tried it
Novarossi made the cooler to get max 30 secs more run time and made for on road engines were they were not getting the 5 minutes required.