My 2005 has 93K miles - almost 7 years old so decided to change plugs. Bosch had rebate on Iridium Fusion Plugs (purchased for <$2 ea at rockautoparts) so I decided to try - despite some comments about Bosch and Toyota not mixing well. Old plugs came out very easily (NGK) and looked worn but still basically OK (see pic). I had noticed more shuddering on start-up and shut down of ICE in last 10K miles or so - which improved a bit after running a couple of tanks of Techron through the system - but still not as smooth as new. DIY's on removing plugs were very useful (especially the one where the guy uses some twine in the plug socket to remove the plug from the hole (I didn't have magnetic socket). The connector for the coil on plug #4 is a bit*ch to get off - I sprayed some WD40 on it, pressed the tab down with a screwdriver (be careful not to slip since the coolant hose is right behind here) and eventually managed to push it off (this probably took the most time of the whole job). Putting the connector back in is so easy - it slides in and locks into position with almost no force ! Torquing the plugs down to correct spec is very important (too loose and the plug may run too hot and too tight you may damage the head) (13Lbs/ft). Fired up the new plugs today and commuted to work. ICE seems to start and shut down slightly smoother and accelerates more smoothly (so I think the NGK Iridiums will last 120Km/7 years - but are maybe not at peak performance anymore at that point) - maybe some of that is physcological ! But so far, no problems with the Bosch plugs. Let's see if there is any difference in gas mileage over the next few tanks. (If the Denso or NGK Iridiums were close in price, I probably would have gone with those - maybe at $6 per plug that should not be an issue - but I guess the Bosch marketing dep't did a good job convincing me ! ) Anyone else running Bosch IF plugs ?