Cat In a Classic

so I got parts together to convert to single turbo,,,I have acert in a 05 classic, does anyone have a single turbo in a classic? I'm trying to figure out inlet piping from air to front of turbo. maybe like a e model.

 

that's close but my air to air is more centered on the side,,

 

already made up my mind to go single. had friend do 3 so far with good results,, he just never did one in a classic, nothing to compare it too. I plan on keeping truck, if turbos ever go out going to be cheaper to replace one than two.

 

well true but hard to find the right person to tune it

 

well I put on a polished/ported exhaust manifold single turbo.. but truck is still lacking/losing power.
no check engines lights, actuators backed off air to air checked. boots ect. I pulled valve covers checked everything(has new wireing harness).

truck is mxs c 15 turned up too 550/1850 .
any thoughts on anything else I can look for? I did also replace boost sensor ,but I don't have a boost gauge in the truck. will be next thing I put in it.