Whats your favorite exhaust brand?
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Now I wish that the 450 had the PE option (only for the valves as the "performance" is really just marketing) but I love my stock exhaust w/DP's. It's all I need. If either of the stock exhausts were super restrictive and there was a reasonable gain in power to go aftermarket, I'd go AWE. The ridiculously overpriced units from Armytrix and others are stupid. I can't believe people actually buy them. You're just paying for a name. Akrapovic is expensive but at least you're getting titanium. If you really wanted a valved rear muffler/bypass option, you could find a shop that knows what they are doing and probably get it done for less than $1,000 all in.
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