I have an 03 evo that is pretty much stock besides I have the Tephra v5.10, Logging boost via JDM Map, Boost control via GM BCS, Direct boost mod, K&N drop in replacement air filter, MAP downpipe/ o2 housing with recirc, and 3" exhaust with test pipe. I bought it all done with 269/269 for power.

It runs good besides it will randomly drop boost off to 10-14 range. It will go back to normal if I shut off the car and restart it again. I have had a dsm for years but am new to the evos. Any idea? I know its not any sort of boost leak.

 

there may be something set up in your ecu i really have no clue but maybe a re-tune would help

 

Thats what I was thinking so ill have to bring it in and have it tuned again. Any other ideas?