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Speedracer747-400

Thunder Alley exhaust

2 posts in this topic

Is anyone running the full Thunder Alley exhaust system with the spark arrestor and 96db quiet insert? I know the pipe rips when unplugged. I'm just wondering about the power when you add the 96db quiet insert. I have a 98 YZ400 and I'm currently running a WB e-series with 12 disks and the quiet core insert. To get it down to 96db White Brothers told me to run 6 disks with the quiet core insert.This seems way to restrictive. I mostly ride single track, fire road, and some desert.

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