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Indecisive if to modify my oem 99 is200 sport


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Indecisive if to modify my oem 99 is200 sport.. want more power but almost impossible without spending a small fortune from the learning ecu to the fact the electronic TB is a d£&k and does what it wants.. throttle response is let’s say.. non existent.. anyone got any advice on improving the dated tb ..I’ve heard about putting the jzx Tb on but standard that throws engine management problems in the mix.. being honest the uk IS is meant to be a bmw beater not a B road basher like the Jdm altezza .. just seems like the platform has a lot more to offer.. love the car .. a lot of car that everything works on 21 years later, Lexus ought to be proud 👍🏻

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