thunderheader true duals
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Joined: Oct 2006
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thunderheader true duals
is anyone running these? how are they...performance,sound etc. also did you use the thunderheader heads? explaine how that works...is it true you use your existing heads with a kit they send you?
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Joined: Dec 2006
Posts: 317
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From: NorCal
RE: thunderheader true duals
With the TD system it replaces everything starting at the crossover which adds an extra joint and clamp in the system. I chose to go with Vance and Hines head pipes and Thunderheader mufflers. Cheaper system. With that and K&N AC it dynoed at 75hp and 89tq.
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