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6.4L Performance Parts Discussion What has or has not worked for you?

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Old 06-24-2010, 05:02 AM
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Exhaust Upgrade

Ok guys I have a few exhaust questions.

First of all is it worth it to do the 4" downpipe? what gains can I expect from this?

Second of all, and my bigger question, is should I keep the 4" exhaust I have now, or upgrade to a 5" system?

Currently my exhaust is a cat-back 4" system. I am planning on getting down there sometime and cutting the cat out, I have the pipe and clamps to do it. I was just thinking that if I am working on the exhaust anyways maybe I should go ahead and update the entire system.

My next question, in following with the 5" question, is what system should I get and where is the best place to get one? What gains will I see with the 5" system? Is it mostly just a sound thing, or will upgrading increase mpg's and lower egt's as well?

Thanks for any help
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Old 06-24-2010, 06:02 AM
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The 5in will give you a slightly deeper sound then a 4in. No one has actually posted numbers showing the difference between a 5in and 4in as far as power.

The 5in won't have the same amount of back pressure that the 4in has, so it's possible that you could even lose some power.
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Old 06-24-2010, 06:12 AM
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I have a 5 inch on my truck and I love it. It sounds great especially at WOT. Now if there is any power difference I don't know. But if you are running a tuner I don't think the lost of power if any from less back pressure wouldn't be noticeable.
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Old 06-24-2010, 06:15 AM
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And as for the downpipe it's up to you. I heard if you aren't making serious power you don't need it. But other guys claim it helps out a lot. So it's all up to you.
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Old 06-24-2010, 06:32 AM
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The downpipe will decrease spool up time therefore faster take off. Less backpressure after the turbos is a plus, but you will not notice a performance difference between the 4" and 5".
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Old 06-24-2010, 08:09 AM
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I look at like this. If I am buying my wife a new set of tits I am going with the double D's not the B cup. So I would go 4" down pipe & 5" straight all the way back. You cant beat the deals from Rudy's Performance. Just my 2 cents
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Old 06-24-2010, 11:08 AM
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I recommend the 4" downpipe if your willing to do it. If your iffy about it then I wouldn't worry about it. As for the exhaust size, I prefer 5" over 4", but 4" gets the job done.
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Old 06-24-2010, 02:02 PM
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Is their anything negative about adding the 4 inch down pipe?
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Old 06-24-2010, 02:04 PM
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Well, not sure actually. I don't know if anyone has been denied warranty work because of aftermarket one. Really the only way to get the stock downpipe back in....and that is if you don't cut it to get it out....is to lift the cab. That would be the only downside of it.
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Old 06-24-2010, 02:12 PM
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4" down pipe back is more than enough for most people. 5" will make it sound louder and deeper, but you wont gain much of anything for power or EGT drop. The down pipe will help some with EGTs if you are looking to get every little bit out of it.
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