Most tuned pipes are made of thin walled aluminum. Why would you try to tap such a thin wall and maybe get a thread in. This is just waiting to strip. Our Thin Walled Pressure fittings are perfect for this! Just drill a clearance hole in the location you want, use a piece of flexible wire and thru the fitting and "fish" it from the inside of the pipe and pull it through. Thread on the nut to "sandwich" the fitting to the pipe for a never strip seal! Sold individually. For .10-1.01 nitro engines.