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Straight Pipe?

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Old 07-16-2014, 07:10 AM
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Straight Pipe?

Besides being way louder what are the actual benefits to getting rid of the cat and muffler in a diesel?

Is there that big of a difference between 4" and 5"?

I'm trying to push more power out of my truck and I think starting with the intake and the exhaust is a good start.
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Old 07-16-2014, 11:44 AM
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Intake and exhaust are always a good start. Most of the upgrade require it and even without upgrades it just breathe a little easier
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Old 07-16-2014, 12:49 PM
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The biggest gain would be gutting/removing the cat. Followed by a 3" (or 4" if you're brave) down pipe. A good air filter (not K&N) is also beneficial. You should look into the 6637 mod or the filter in my signature. (I think I'm the only one here that uses it.)
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Old 07-16-2014, 06:55 PM
Kingkong0192 Kingkong0192 is online now
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Been looking around for turboback kits. (Don't want to run a 4 or 5" straightpipe from a 3" down pipe on the turbo. Figure that defeats the purpose.)

Anyways I found this diamond eye 5" turboback kit. Anyone ever run one?

I'm strictly looking for power and performance from this. Granted I love the sound of the turbo whistling but I don't want it to be flat out obnoxious.

tp://whitesdieselperformance.com/store/upload/index.php?route=product/product&product_id=59

Looking into that 6637 mod as soon as I get home.
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Old 07-16-2014, 09:24 PM
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A 3" downpipe into a 4" or 5" exhaust will not "defeat the purpose." That is just a common misconception. A 3" downpipe is probably good to 450 - 500 HP. Plus anything larger than a 3" is a major PITA! A 3" is hard enough. If you read the description for the kit you posted in that link, it says it comes with a 3" downpipe.
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Old 07-16-2014, 09:59 PM
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Get a 4" diamond eye kit from clay at riffraff and be done.

As said a 3" dp will support 500hp.

The difference between 4"-5" exhaust is mostly sound
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Old 07-16-2014, 10:55 PM
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I just put the Diamond Eye 5" straight pipe on mine......I like it
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Old 07-16-2014, 11:48 PM
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Go big or go home!!!
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Old 07-17-2014, 12:40 AM
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I have the diamond eye 5". Pretty nice kit. Love the sound.

And unless my exhausted math is way off, a 5" exhausts cross area would be like 60% larger than a 4".
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Old 07-17-2014, 04:08 AM
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Quote:
Originally Posted by FI460 View Post
I have the diamond eye 5". Pretty nice kit. Love the sound.

And unless my exhausted math is way off, a 5" exhausts cross area would be like 60% larger than a 4".
Either of you have a link? Think i'm going to just pull the trigger and do that.

Pretty sure i caught the fever. I am having way too much fun spending money on this thing.
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Old 07-17-2014, 07:27 AM
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Diamond Eye 5" Turbo Back "Offroad" Exhaust - Riffraff Diesel Performance
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Old 07-17-2014, 08:25 AM
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Quote:
Originally Posted by Kingkong0192 View Post
Either of you have a link? Think i'm going to just pull the trigger and do that.

Pretty sure i caught the fever. I am having way too much fun spending money on this thing.
There isn't a cure, either. Gets worse when you have multiple trucks.

I'm sure I'll be looking into this when I pick mine up next weekend.
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Old 07-17-2014, 11:24 AM
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Quote:
Originally Posted by FI460 View Post
I have the diamond eye 5". Pretty nice kit. Love the sound.

And unless my exhausted math is way off, a 5" exhausts cross area would be like 60% larger than a 4".
I calculated 56% (not accounting for wall thickness), but "po-tay-to" "pa-tah-to", right?

I have the 4" system and love it, but I've never heard a 5" system as far as I know.

Quote:
Originally Posted by Kingkong0192 View Post
Either of you have a link? Think i'm going to just pull the trigger and do that.

Pretty sure i caught the fever. I am having way too much fun spending money on this thing.
We call that PMS, PowerStroke Modification Syndrome!
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Old 07-17-2014, 12:21 PM
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Quote:
Originally Posted by cowmilker08 View Post
We call that PMS, PowerStroke Modification Syndrome!
Yup and I can normally keep it under control until Travis cones around. Lol
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Old 07-17-2014, 12:37 PM
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The only thing keeping mine under control is lack of funds, lol. I have done all the cheap mods.
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