well i got the 4 inch on the truck. i decided to cut and weld in my home built 3-4 adapter after the first elbow at the down tube. total length of 3 inch is about 2 feet long. did i waste my time by doing this? should i have just came all the way up? next, does a pyrometer go in the manifold or the exhaust? thank you all for your help!

 

Most people put the pyro in the exh.manifold pre turbo,drill it out and tap it ,I built a 3-4"the same way you did a few yrs. ago and one from the turbo back 3-4"and I don't think you would gain much by doing it from the turbo,other then a couple of more hr. fitting and welding

 

I bought an MBRP 4" down pipe when i did my home built 4" exhaust... I found it new for $105 at a local diesel shop and cudn't pass it up. EGT's stay in check and it sounds really good

 

I didn't notice any improvement with 4" after the stock downpipe. Right now i'm running a 2nd gen 4" downpipe and it dropped the the egt's quite a bit. If you dont tow heavy your setup is fine.

 

what would the happen if i did tow heavy? high egt? from the short peice of 3 inch. it sounds pretty good and it looks pretty good.

 

need some pics!

 

The stock pipe has a bend in it that reduces it to 2.5 in. When I still had it on I could hit 1500+ towing 10000lbs,but I have bigger than stock injectors and a turned up pump. Now it only does 1000-1200 wot and I went from 18mpg to 21mpg empty just changing to a bigger pipe. It took me six month's to get the nerve to hit the buy button for my downpipe but i'm glad I did because its the best mod ive done so far.

 

Here what it looks like.

 

that looks great! where did you get the first 45 elbow from the turbo? mine comes out horizontal.

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i cant seem to get pics on here!

 

here are some pics. cant see it verry good.