5" or 4" exhaust?? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 08-08-2013, 07:08 AM Thread Starter
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5" or 4" exhaust??

Looking to start shopping around for performance upgrades. Been reading alot of posts here about DPF deletes and tunes and how the general consensus is everyone seems to wish they would have done it sooner. I already have an S&B CAI and am planning on going with a mini max tuner, DPF delete and EGR block off plates. As far as the exhaust what are yalls thoughts as far as 5" or 4" Pros or cons to either? Turbo back or down pipe back or is there a difference? I also plan on going with a muffler rather than a straight pipe.
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post #2 of 6 Old 08-08-2013, 04:06 PM
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I don't think anyone makes a true turbo back right now...I could be wrong but 99% of the kits I see are downpipe back. Since the 2011+ have a good designed downpipe that's large diameter already there won't really be any difference at least on stock turbo power levels.

The 5" is a lot louder than the 4" I'm told. I run open downpipe on mine and it's not bad dumped until you get on the throttle hard then it's NASCAR loud which is fun and fine with me since it isn't full time. The biggest change with either if you're going to delete is you hear a ton of wastegate squeal/turbo whistle. The wastegate squeal bothers some, I'm just used to it at this point.

You don't really need the block off plates if you're running the mini max you can just tell it to turn off the EGR I believe.

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post #3 of 6 Old 08-09-2013, 10:38 AM
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The 5" exhaust is just for looks. Nothing wrong with it, but needs said. Nothing wrong with a 4".

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post #4 of 6 Old 08-10-2013, 03:48 AM Thread Starter
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Thanks for the input guys. I was leaning towards the 4" mainly because it was the cheaper option and I don't want it to be too loud. Now to try and come up with the cash to actually make it all happen.
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post #5 of 6 Old 08-10-2013, 06:50 AM
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I'd go with a 5 inch...just save a little more money and buy the right one first...you will be happy with the 4 inch for a while but down the road you will only want to upgrade to a 5 inch....might as well do it right the first time...
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post #6 of 6 Old 08-10-2013, 08:04 AM
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I just went with a 5" system with muffler, hoping the muffler will keep the nabors happy.

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