so i have a 2.5 inch down pipe, but a 2.25 inch exhaust. is that a problem??do i need a bigger exhaust or will it work the way it is?

 

all you need to do is get a reducer in the same material you are using for the dp. get an exhaust flange and weld the 2.25" onto the flange and then weld the dp to the 2.5" part.

you will need a 2.25" to 2.5" reducer.

 

its better to go bigger piping. how much boost are you running? i notice alittle difference switching to a 3in and better spool. it shouldn't be a problem if your not running anything too crazy.

 

it will help but its not needed.

Anytime u releive backpressure from the exhaust side of a turbo u will gain all the good stuff with out the bad.

 

i'm planning just 8 psi 10 at the most. i bought the exhaust before i wanted to go boost. poor planning on my part. but its not going to be a huge drag on hp, or do anything else that could be bad??