5" downpipe and delete vs 4" delete

[blk450er]

Currently I have the stock down pipe and cat with a dpf delete and 5" filter back magnaflow. I want to do the full cat/dpf delete pipe but am tossing the idea of just doing a 4" cat/dpf delete pipe with the stock down pipe or doing a 5" down pipe and delete. Would I notice a difference in just sound or sound and power? Trying to decide if its worth the price difference. Is the stock down pipe crimped and doesn't flow that good?

[ryandamo]

its not that crimped but if you cut it half, you will notice its alot narrower than it appears because it is double walled and has a pipe within a pipe

[studded]

i just went with the MBRP 4" stright pipe kit and there downpipe. Looks like a really nice piece will be doing the install tomorrow

[blk450er]

Are the downpipes hard to install? Doesn't look like a lot of room to work on these things

[blk450er]

Originally Posted by studded

i just went with the MBRP 4" stright pipe kit and there downpipe. Looks like a really nice piece will be doing the install tomorrow

Do you have a pic of the set up? Or maybe during your install, a side by side comparison? I'm curious to see the difference between the two

[08SuperDiesel]

Originally Posted by blk450er

Are the downpipes hard to install? Doesn't look like a lot of room to work on these things

They typically need to be cut up a ways to get it out. Install is easy just know your morman type clamps which hold the pipe to the Turbo. My buddy took care of that. I am pretty sure I would have broken the clamp somehow if I messed with it

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[blk450er]

Morman clamps. Not familiar with those

[travisH3]

Using the stock down pipe, buying a dpf and cat delete pipe, and using the 5" magnaflow dpf back will not sound alot different than doing 4" turbo back. It may have a little deeper sound but hardly any change. Power wise you won't notice anything seat of the pants feel. Mainly what your gaining by installing a new dp is lower egt's. I'm running stock down pipe, 4" dpf and car delete. And then magnaflow 5" dpf back exhaust. There isn't really much you can do for the 6.4 to make it louder. I want to go back to a single turbo setup. Watching videos of 6.4' s with single turbo's on YouTube have gotten me wanting to do the switch. That's the only reason I miss my 6.0. I loved the rattily sound of the engine and I loved the turbo whistle and roar of it.

[blk450er]

Sounds like for now I'm just going to do a delete pipe and not the down pipe. How much louder will it be by removing my cat. That is the only thing left to remove. Right now I can barely hear the exhaust over the engine, which isn't loud in itself. And there's so many options out there as for brands....

[Capt dong]

there is no 5 inch downpipe. they are 4 inches. they will usually mate with either 4 and 5 inch dp back exhaust system.

removal of dp requires either unbolting trans, lifting cab or cutting factory dp.

its been said the a bigger dp lowers egts and improved flow/throttle response. i have cai tuner and dp back exhaust and theres practically no lag if any at all. hope that helps.

a bigger dp will a mod in the near future.