Outer Limits 4x4 Board

hey .me boss wants to put extactors on his td42 ute. i have heard that there is 2 different sizes of exust to run and that they are very different.wat system is the best?? muffler or no muffler?? cheers joel

extracters coupled to a 2.5" zaust with a muffler ... no muff would be hell loud

in saying that .... N/A diesel with and exhaust isn't worth the power gains for the $$ outlay