have d15 turbo with check valve but at 6psi of boost throw code 3(map) is there missing link for it or must i use boos controler )

 

More check valves, bigger map sensor, or program around it.

 

thanks I'll try it . if loking for old honda cars 89-91 parts philly, pa has lots of parts
and junk yards that have the parts for cheap. manifolds for around 25 buck trans for 150 and tran/engines for 250 if you need.