Cel code 05 duramax

[superbdiesel]

I'm getting 3 check engine light codes from our 05 gmc W/ Duramax. We resently perchased a dual 4" turbo back system from RPM Outlet. After installing the system W/O cat we recieved these codes:

PO299-Turbo under boost

PO401-Egr flow insufficient

PO404- Egr flow Ckt range/perf

Engine model # 5GMXHO6.6591

Please e-mail me with the fix if possible.

Thanks

 

[DMAXcountry]

some lly-s will do it, some wont...

youre going to need an egr block off plate and a finger stick to fool the computer. Kennedy Diesel has both things