Wrapped headers would give higher exhaust temp and with that higher exhaust velocity. A well known mod. But when wet, it's hard to get temp up because of soaked exhaust wrap. Wouldn't effect engine heat much more than what heats comes from better combustion.

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XTX 2011. Yamaha Hand Guards, Akrapovic slipon mufflers, Snorkel removed, Airbox drilled, AIS Blocked, PCV, Dynojet Autotune, Kev O2 Controller, Dna Stage 2, KN air filter, mini indicators, steel sprocket cover, cnc levers, cnc mirrors.