Exhaust System Construction

In this section I will try to explain some of the basics of exhaust system construction. The examples shown will be a "two into one" system I am building for a 175cc (bored to 200cc) Honda Twin (CB175).  The methods and materials would be the same for a single cylinder system, or just about any other kind of exhaust system.

	Here we see the parts I started with. Pipes are mandrel bent mild steel tubing. In this photo the megaphone has already been rolled up into a cone. I did this using a "slip-roll" machine. But it can be done in many different ways. Don't get frustrated, it can be difficult. This example is made from 22ga. mild steel. In the photo it has hose clamps installed on it to adjust the seams so they can be welded.
	Here we see a close up of the megaphone with the clamps installed.
	Here I've started TIG welding the seam. Moving and adjusting the clamps as I go to keep the seam properly aligned.
	Welding is finished, just a little grinding and polishing left to do.
	The finished product! Remember, the length, inlet size and outlet size of a megaphone will vary from one type of engine to another. Just because one size megaphone makes power on one particular engine doesn't mean it will make power on another..