3 Inch Mandrel Bent Exhaust...what is your recommendation , with or without Cat Conv

I just finished fitting a DEA 3" exhaust to my 08 patrol with cat sounds good had a hard time removing the old one.(that's what took most of the time) every thing fitted fine except one bracket near the auto gear box.
Took it for a drive it is a lot more responsive no turbo lag now.

Got a 3" Genie SS on my 2009 and love it. Sounds soo sweet and noticed it even pull a bit harder. Have had no issues with it at all.

Quote:

---

Originally Posted by crazyenough

Got a 3" Genie SS on my 2009 and love it. Sounds soo sweet and noticed it even pull a bit harder. Have had no issues with it at all.

---

Straight? Or you get a cat or muffler also ?

Quote:

---

Originally Posted by hybrid

So are you saying that a 3 inch exhaust system causes the turbo spikes? and that's why you need the dawes valve?

---

ill tell you what you can try call beudesert exhaust ask for a price for a 3 inch system and go from there.

Thought I'd add something to this. As my car's been at the mechanic and dyno over the last week or so, while I was there I bumped into a bloke with a 2013 CRD cab, manual.
He had endless issues with turbo spiking and limp mode with a 3" exhaust, and in the end the shop where he got it done, dropped it down to a 2.75, and hasn't had a problem since...
This bloke is older and isn't too technically involved under the hood, so he had no clue about dawes valves and such at the time. This could have ironed out his problems quickly. It just seems to me that some CRD's are too sensitive to 3" than others, on some it works perfectly and others not so. The dyno guy showed me a few charts of factory CRD's, and the default boost control is absolutely S***! It is just a mess of zigzagging lines all over the place... Adding a exhaust just multiplies the problem without some boost control.

Yea I agree, just watching the boost Guage confirms this as its all over the place and thats driving casually

Quote:

---

Originally Posted by Hodge

Thought I'd add something to this. As my car's been at the mechanic and dyno over the last week or so, while I was there I bumped into a bloke with a 2013 CRD cab, manual.
He had endless issues with turbo spiking and limp mode with a 3" exhaust, and in the end the shop where he got it done, dropped it down to a 2.75, and hasn't had a problem since...
This bloke is older and isn't too technically involved under the hood, so he had no clue about dawes valves and such at the time. This could have ironed out his problems quickly. It just seems to me that some CRD's are too sensitive to 3" than others, on some it works perfectly and others not so. The dyno guy showed me a few charts of factory CRD's, and the default boost control is absolutely S***! It is just a mess of zigzagging lines all over the place... Adding a exhaust just multiplies the problem without some boost control.

---

exactly 10 in a row are good with 3" the next couple are no good there then comes your way a pain in the freckle

Hey Hodge,
Great info , how is your truck set up?

Quote:

---

Originally Posted by kevin07

exactly 10 in a row are good with 3" the next couple are no good there then comes your way a pain in the freckle

---

That's right, it's hard to believe that such small difference in exhaust size can make a difference in how the ECU responds.

Quote:

---

Originally Posted by hybrid

Hey Hodge,
Great info , how is your truck set up?

---

I have a 2.75 Beaudesert pipe, and a wastegate actuator system setup.

Quote:

---

Originally Posted by megatexture

Straight? Or you get a cat or muffler also ?

---

with a high flow cat and muffler. It's there kit they sell.