Easy to install, DIY youtube videos are great for this, just make sure you have the right tools. The blasted factory Tokoko were replaced with them on the 2004 4runner. nice smooth ride!
Pros
. This Cardone FLASH2 Flashbox can flash OBDII ECUs for Ford, General Motors, Chrysler, Honda, Acura, Toyota, Scion, Mazda and more as well as all GM OBDI applications! The J2534 compliant FLASH2 All-Makes Reprogrammer has the ability to reprogram and update any make of vehicle as new original equipment manufacturer (OEM) data is released and validated.