Mephesto is a very good engine, very easy to drive and gets decent mileage, don't be afraid to run it with a 7.5mm venture to get the power out of the engine. You will still get good mileage with this setting.

YES..... add the water into the pipe and use the black caps that come with the engines to cap off the ends.....cant believe someone asked that...smh. Leave pipe in freeze over night at the most and it will push some bad dents out of the pipe. Do not leave the pipe in the freezer to long as it will hurt the inside of the pipe baffles.

To clean the pipe, soak in concentrated anti freeze in old crock pot on low for about 5-6 hours. Take out and polish with clean towels and chrome polish. A Dremel and polish tips work good or a big table buffer works even better.