Big differences to how an N/a engine v's turbo engine in response to 'tweaking'.

What may work on an n/a as a tweak may 'pop' a boosted ej.... I.e CAI on an n/a = no retune, cai on a turbo = retune or start looking for a new engine!

Underdrive pulleys and lighter flywheels don't require a re-tune....they remove parasitic loads off the engine....therefore allowing more usable power to reach the road.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]