Everything I've read states that enlarging the exhaust system on this B20 in a 122 would make for a better breathing motor. I've got a cut down intake/exhaust manifold on a B20 with E head. This would be a dual exhaust manifold with SU carbs. I'm using the dual header pipe and stock exhaust system, which is still in great shape.

I'm thinking going to 2" stainless. Who makes/stocks this system? Would it be idntical to stock but just a tad larger in diameter? Assuming that I can keep the same manifold setup - any problem there? Though stainless is very attractive (won't have to fight rusted pipes and mufflers apart again) I hear that they have a tendency to crack if under stress. Who's done this, and is happy, or thought about it and didn't and why? (aside from the cost)

A friend bought stainless system from Swedish classics for his wagon and had to have the long straight section rebent as it headed off to the right rear wheel as it came from the factory. thanks