I'd suggest a new high flow airfilter such as DNA/K&N, then open up the air box top which perhaps has already been done. Kev's fuel mod (search this site) is a sensible addition or a power commander if you're feeling flush.

What pipes are you running as free flowing pipes obvioulsy help the engine breath. Look also at removing the AIS pipe (search site for how to do this).

Your right wrist may also need calibrating to get more MPG!!

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