stock exh. vs SX1

Just bought a 02 yz 426 and was wondering how well the stock exhaust flows vs a full SX1 exhaust system I have off my old WR

Which head pipe do you have?? The torque or rev?? Even though the stock system is a good one, the SX1 will flow better for you. It has a bigger core in the silencer and a bigger outlet. I took the SX1 rev system off of my 98 and bolted it up to the 01 when I got it. It never missed a beat.

You may have to richen the jetting a bit on the main and pilot. I would see how it runs first then make some adjustments. Any questions, let me know.

Ernie

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