[Talonmotorsport]

It will certainly breathe easy if your using 2" tube as the primeries. You could use a bi-metal 2"-50mm hole saw in a pillar drill held by a very good vice thats clamped down. Run the drill at it's slowest speed and cool it down half way through with some water. Do not try and use a pistol drill you WILL end up hurting your self. Another way would be to cut a 2" hole in a piece of paper and use as a template to draw around and chain drill the tube and file to fit.