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Message: <blockquote data-quote="wirafly" data-source="post: 812662" data-attributes="member: 10859">You need to rebore the intake manifold if install larger TB provided the original intake manifold hole small. normally our fuel injection engine managed to retune and maximise the AF ratio at low rev, we will feel low end torque lower after install Bigger TB/Open Pod Filter is due to the reason the ECU processing power not fast enuf to calculate the correct AF ratio to optimise the performace(that why most car manufacturer/after market ecu claim how many bits "8bits/16bits.. chips insided" )People tend to use piggy back to cheap the ECU on signal from sensor, then ECU tend to provide richer or leaner AF mixture......but we dunno really need a piggy back ecu to retune as the the modification on TB considered minimal, my suggestion is to install FPR(fuel pressure regulator) to raise higher pressure.I got spec from internet regarding 4G9X about cam4G91 Cam specIntake ExhaustOpen 13 degree 51 degreeClose 51 degree 13 degree4G93Open 20 degree 60 degreeClose 60 degree 16 degreeI have no idea on how high the cam lifting, but from what I know is higher lifting provide better tork and better idling speed, if 4G93 cam lifting is higher then is worth for investment.....again....since I never try 4G93 cam on 4G91 engine....I cannot comment any on idling stability and the power......maybe to those who have change can comment on this.</blockquote>

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