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I recently purchased a 2001 is300. I've been putting together a part list for a budget plan. One thing I cannot seem to find out for myself would be the ecu chip thing. I do have a cat on the list, I just don't know what i should buy tuning wise.
jb4store.com
I've found this online and would probably be the cheaper way to go. If its even the right thing. As you cans see this part really confused me.

Burger Tuning BMS Lexus JB4 Tuner
JB4 Applications • 2016+ Lexus RC200t • 2016+ Lexus IS200t • 2016+ Lexus GS200t More Horsepower and Torque! This plug and play tuner attaches to easy to access sensors in your Lexus engine bay and works with your factory DME tuning to remap your boost, timing, and fueling for optimal performance...

I've found this online and would probably be the cheaper way to go. If its even the right thing. As you cans see this part really confused me.