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View Full Version : yz426 Thunder alley head pipe



ss440ex
11-05-2006, 05:59 PM
For anyone doing a exhaust system on their Hybrid.
Or an up grade.
Try Thunder alley`s yz head pipe.
A big inprovement over the OEM.
Lots of low end and noticiable mid range.

Affordable and great looks!:D

800screws
11-06-2006, 04:23 PM
got a link?

ss440ex
11-06-2006, 08:26 PM
www.thunder-alley.net

11-07-2006, 07:29 AM
yz aftermarket headers dont do much. For the yz usually you get a smaller diamiter or a larger diamiter header. Larger= more top end and you loose bottom or small header any you gain bottom but loose top. Changing the muffler only adds 2hp. The yz motors come stock with good flowing systems.