you cant just replace the stock map sensor with a 4 bar map sensor. the stock map sensor is like a 2.3 bar and the only one that really works with the stock ecu. you need a replacement 1jz/2jz oem map sensor.
1995 Lexus SC300 5spd Na-T ( TT Ecu Mod + a few others)
2003 Lexus GX470 AWD (Lifted w/285's on Tundra wheels)
Before doing any business with Lextech Lighting, note they are not
a CL vendor.
Please read one of the current review threads about them
Then see current CL vendors for your cluster and lighting services!!!