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Pickups Diesels 4" vs 5" Exhaust
6 messages, Last post on Apr 23, 2008 at 3:04 PM
You are in the Diesels Forum. Your Host is kcram
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I am looking at changing the exhaust on my '99 F350 Super Duty with the 7.3 Powerstroke. I have seen and read about 4" exhausts and 5" exhausts. Does anyone have any experience with either or both. Is one better than the other? My truck is primarily used for too and from work during the week (when I am not in Iraq). I do pull a steel three horse trailer on weekends....about 9,000lbs. So, when I get back, I am looking for the best exhaust to put on the truck and potentially an exhaust break. Recommendations anyone? Thanks!
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Replying to: bartf350 (Apr 23, 2006 9:37 am)
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Replying to: ddf1 (Apr 24, 2006 6:40 pm) Thanks! I am still researching. I do understand that changing the exhaust also means I should change the intake as well.....a whole package deal. I will keep the thread going as I find out more information. I am trying to find every article I can to find an answer. Thanks again and take care! |
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| I will clear up a misconception. A turbocharged diesel engine does not need backpressure to run. It is force-fed by the turbocharger, and the worse you will get with a free flowing exhaust system on your 99 is a lighter wallet. I owned a 99 with a 7.3 and installed a Magnaflow turbo-back kit. Got it for 400 bucks. With the exhaust system you will see quicker and better turbo spool up which results in more boost faster as well as lower exhaust gas temperatures. 5 inch exhaust will not get you any more power, it is mainly for cosmetics. The factory turbocharger outlet is only 3.5" so 4" is the most ideal size. It sounds like you have a daily driver and not a purpose built drag racing or sled pulling truck, so don't throw away money you don't have to. Also you do not have to change the intake, but on a 7.3 I would recommend it. It is pretty restrictive. Ford offers a Severe Duty kit, or you can spend the money on something like an AFE, or AEM Brute Force kit. Don't buy K&N for diesel. Get a good filtering kit, because you do not want anything getting into a high compression diesel engine! Join www.powerstrokeforum.com it is a forum specific to your truck. Look for me, my name is 99smokin73stroker. I will continue to watch this thread. | |
I have been reading the posts on exhaust systems but they seem to lean towards diesels. I have the 6.8 V-10 on my F550. I tow about 12,000 lbs up a hill that makes me gasp when I try to walk up it. I know my 5 will pull a house down (that's why I bought it) but I want to make it a little more efficient and sounding cool won't hurt either. I already have the K&N. How big should I go on the exhaust?
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Replying to: mscan (Apr 22, 2008 6:12 pm) kcram - Pickups Host |
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