Nice! As always, appreciate the info! Got them on today, along with drilling/cutting out the holes close to the intake... a cool modification I read about in a couple places on here! The tool I borrowed from Autozone wouldn't fit around the upstream sensor, so I removed the exhaust manifold heat shield thingy, hoping nothing else would come off (catalytic converter, etc. ) and used a wrench... SEEMS to have made an improvement; the sensor and the cutting... drove for a little bit earlier, with only about 10 holes cut out & factory sensors, and didn't notice much, if anything... I'll be going out for some more 0-60mph tests tomorrow, and will report back soon!