Hi guys,
Just new to this diesel thing but loving it. My question is this I tow a horse float (4000 pounds) and would like a little more power. The Truck has a 2.5" daul exhurst on it now, in your opion would I be better to go to a single 3" system.

The reason for my thoughts is I have been looking on the Banks turbo site and saw the Stinger kit.

I don't believe the turbo is the way to go with upgrading pistons from what I read on these pages.

Any help would be great

Thanks Rick

The 2.5 inch dual will let your exhaust flow easier than a single 3.0 inch pipe. The two 2.5 in. pipes give a cross section area of 9.82 sq. in. versus 7.07 sq. in. for the single 3.0 in. pipe. The larger area will give you less back pressure. Headers with dual pipes would lower the pressure even more plus preventing the cross feed present in the exhaust manifold.

There is another factor present in the stock manifold and that is that the outlet throat of the manifold is less than 2.5 in. I haven't measured it, but it may be less than 2.0 in. I don't know if a better manifold is available or if anyone has reamed out the throat of the stock manifold.

Stock manifold outlet is 2.25"

bigger=less restiction=more power

I've seen posts on this in the past and the conclusion is bigger exhaust helps with EGT but not horsepower. Get a programmer/chip if you want horsepower. The exhaust will just let you run harder and higher tunes without cooking.

4000# trailer is negligable. If you have horses in it, wouldn't want to knock them over accelerating, even with stock power ;)

Cegusman: Is the 2.25 in. dia. at the exit of the manifold or measured at the throat which is up a couple of inches from the outlet. I just remember seeing the restriction and I wondered why did GM do that!!!

Cegusman: Is the 2.25 in. dia. at the exit of the manifold or measured at the throat which is up a couple of inches from the outlet. I just remember seeing the restriction and I wondered why did GM do that!!!
Should be at the exit of the manifold. I will have to look tonight, I have my manifolds off right now.