i installed everything onto my 2003 gs430 yesterday, hooked up all the wires for the ecm. now how do i know if i did everything right and that it's working properly? as long as the check engine light doesn't come on im ok? thanks

 

when i did mine on my 98 gs400 i accidently sodered one of the wires wrong and it sounded like ***** when i started it and would not exceed over 45 mph... lol as long as u followed the instructions u should be good.. when i did mine wrong the check engine light did come on, so i corrected the wires and the light went off... gl

 

If you installed something incorrectly, your CEL will come on almost immediately. Some even had problems with their cars starting after incorrectly installing the intake. If you aren't having any idle or CEl problems, you should be good to go!