i am making up a turbo set up for my 01 durango and i cant figure out what size exhaust to run to the turbo(remote mount turbo)should i run 4 or 5 inch ,currently i have true dual 2.5 inch and puttin down over 415 at the crank ,any ideas would help

 

id run 3" the the turbo flange and 4" to 5" off the turbo it self

 

I would diffently keep the turbo under the hood, because I have heard of alot of problems with the remote mounted turbo systems. People have been having problems with the oiling system to the turbo, in which the turbo is siezing up from the lack of oil. I would diffently use a 4" to 5" down pipe and a single 3" exhaust all the way to the back.

 

I'd be more inclined to run 2.5" to the turbo, and then atleast 3" out. The reason is because you will lose exhaust velocity and heat with the larger pipe. If you think that 2.5" is too small, how big do you think the inside of the turbine housing of the turbo is? My turbo hasa 1.32 a/r turbinehousing and I assure you it's not even 1" diameter inside.