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also in case anyone wonders why i bring this up, i used to own a gs400 and for the most part all users said that lexus tuned it so well that there were no gains to be had. that went on for the longest time until someone actually went in and looked for the bottleneck, which were the stock headers. a fellow went and designed a better flowing header that when coupled with a good exhaust and freer intake, led to gains that weren't seen before the header's introduction. it wasn't so much that lexus made the ultimate machine as lexus tuned the car's exhaust to be quiet at the cost of performance.
There's always room to be made and i really want to see what i can uncork out of this 2.5. any help would be appreciated.
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