I'm thinking about putting duals on my 97 7.3 Powerstroke F250, and I was wondering how well (y-ed after the gutted cat) and no mufflers with 2.5inch pipe would work. I know 2.5inch pipe is pretty small, but on a stock motor, I was wondering if 2.5 inch duals would be fine or if I should go ahead and upgrade to 3 inch duals. Any suggestions you guys could give would be great! Thanks!

 

I would go with the dual 3" pipes - that will give you about 14 square inches of cross sectional area, compared to 12.5 from a single 4" pipe. Dual 2.5's will give you about 10 square inches. Since most people seem to prefer at least a 4 inch pipe, I wouldn't go any less than the 3"inch duals if dual exhaust is a "must have'.

 

I have duals on my 97' (picks in my gallary) If goes from the stock DP to a 3" pipe, then Y-ed into 2.5 i did it just because that was all that was laying around my friends shop when i stoped by..... sounds great and preforms pretty well.... but i'm gathering up parts to make a custom 5" dual system w/ a new DP, just because.... If i were u, i'd go at least 3.5" duals or 4".... 5 isn't nessicary.... but whose going to tell me to stop?

-Robb

 

Do you have gauges? With the small diameter exhaust what are your temp readings

 

Look in my gallery of pics, both trucks have a good pic of the Y after the missing cat.

The '97 had 2.5", going to the side pipes, then I picked up a stick of 3" and I noticed no difference in temps when I had that put on. the real restiction is the stock DP. get rid of that and get a 3"-3.5"-4" and you'll be good to rock.

On edit. Robbgt has since sold his truck and not here much any more.

Diesel Rod