I've been told that 'non-directional' tread patterns are quieter. Don't know how much truth is in that.
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2008 Electric Orange LV XR5. With dreamscience strategem SCT, K&N 57i Gen2 cold air intake for more fun and demonic vaccum cleaner noise!! 
1975 Mitsubishi/Chrysler GC Galant 2-door Hardtop. 4G63 DOHC heart transplant nearly complete!
Check out the build over here
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