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No one tunes my car ? But has potential.

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I am new to tuning and hp academy. I have a 2010 lexus gs350 awd. A 305hp 3.5L v6. Yes, stock this is a grandpa luxury sedan. But I have got it dialed in where I want it except tune. This ecu is apparently extremely hard to crack and reflash. Any tips to reflashing something this complex ? No one makes a jumper harness i am told and tunes are basically not heard of for this vehicle, even some standalone company's have said it isn't possible due to the direct injection fuel injectors.

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Check this thread - https://www.clublexus.com/forums/gs-4th-gen-2013-present/873217-rr-racing-gs350-tune.html

There seems to be quite a few places offering 'tunes' - are you more interested in doing your own, though? In which case this may be helpful? - https://www.vividracing.com/lexus-gs350-ecu-tuning-i-12448.html