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Hmm I have been wondering the same myself, ANYONE out there tried anything besides the SRT???? Id like to get something
pretty much what it sounds like.
You get the SRT intake tube, filter, bracketry, and a small preprogrammed fuel controller that is wired into the factory ECU.
Our factory ECUs are rather wierd, but very nice at the same time. The stock IS300 ECU alters it's fuel perameters depending on driver input. In other words, it matches it's driver's style. If you are hard on the pedal alot, it will tune itself for more power and poor fuel economy. If you drive like a grandma, it will detune itself, and sip fuel miserly.
Here's another way of putting it. Take two IS300s. Both same mods and milage. #1 has a driver that can't keep his foot out of it. #2 has Ol' Miss Meridith behind the wheel. Take both cars, and run them on the dyno. #1 should lay down around 200whp. #2 will smack down around 165-170whp. Now, if you switch drivers, car #2 can eventually change itself to the driver's demands, but it takes time... Time that pisses me off when I've getting ready for a full-blast run on an autocross course or on the drag strip.
The SRT ECU detects when 100% throttle is used, and inputs it's own fuel map into the mix; overidding the factory fuel map, no matter the driver.
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