97 7.3 change to straight pipe - Ford Powerstroke Diesel Forum
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Old 02-08-2011, 04:56 AM
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97 7.3 change to straight pipe

hey guys was wondering what everyones results have been by changing to a straight pipe from the turbo back? any mpg increase or get up and go? have 3 inch downpipe and 4 inch exhaust now with intake and programmer. does anyone make this pipe or is it just easier to fab myself? is there any reason not to do this change? any ideas and input welcome!
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Old 02-08-2011, 06:39 AM
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you ahve a 3" DP and 4" pipe already? as long as you dont have a cat or restrictive muffler there wont be much difference. just sound more than anything.
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Old 02-08-2011, 02:45 PM
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yes have 3" and 4" but still have cat and muffler. was just wondering if freeing it up more was worth it. figured would make more noise but should also free up turbo some correct?
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Old 02-08-2011, 02:48 PM
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Take it off! My truck came completely stock, with the flat downpipe, cat and muffler. now it's got a 3" DP and straight piped stock exhaust. It whistles more, sounds better, gets movin a little bit quicker, and gets better MPG
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Old 02-08-2011, 03:04 PM
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thanks! sounds like thats my next project when things warm up a bit. does anyone make a slip on to fit inplace of the cat and muffler?
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Old 02-08-2011, 03:08 PM
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I couldn't tell ya, I just welded pieces of pipe in place of mine lol. But I'm sure if there is, someone will step in and tell ya.
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Old 02-08-2011, 03:12 PM
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thanks! anyone else with some help on slip on pipe?
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Old 02-08-2011, 03:49 PM
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Diamond eye makes a whole exhaust kit for about 300 bucks on ebay straight pipe but the cat delete pipe is 50 bucks extra.
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Old 02-08-2011, 07:32 PM
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If you have emissions, you will have to keep a cat on there, like I do


A stock cat is a pile. It (at least on mine), did waaaaaayyy more to silence the exhaust then the muffler did. There was no whistle from the exhaust, hardly any rumble, and did not flow near as well, even with the muffler gone. I hollowed out my stock one and am planning on putting it back on before I have to get tested.

One of my buddies on the other hand, who has a 97 7.3, has an aftermarket Magnaflow cat on his, and you would never even know he did. It pretty much sounds just like every other straight piped 7.3
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Old 02-08-2011, 10:39 PM
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Quote:
Originally Posted by strokin97f350 View Post
thanks! anyone else with some help on slip on pipe?
There are plenty of places out there that sell them. Just look for cat delete pipe or muffler delete pipe.

google.com
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