3" vs 4" strightpipe
 

how much of a difference in egt's would the 4" make over the stock 3"? I'm planning on adding an Edge comp box and maybe some mild injectors and was wondering if the added expense of a 4" system would be worth it. Or if the stright through 3" would keep my egt's around the same. Thanks for your input!

i left about 3 foot of three inch on the turbo and then put 4 inch on to 5 inch stacks and it droped 135 on criusein egts.
that was from 3 inch with resonater to 3 to 4 to 5 straight piped

anyone else?

When i pulled my 3" with cat off, for my straight 4", EGTs dropped around 250-350* at full throttle 5th gear. Cruising they dropped around 200-250*.