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

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Old 09-25-2013, 04:51 AM
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Back to Stock

Had a new 4 inch downpipe and 5 inch exhaust installed on my 6.4 and now want to take it back to stock. Am I going to have any issues with the stock exhaust matching up with the aftermarket downpipe that was installed ?

Also plan to put back in the stock air intake. Does anybody know of any issues with too much airflow in making the truck throw codes in having the new downpipe ? I thought I remembered reading something about that somewhere.

Thanks
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Old 09-25-2013, 05:22 AM
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It will bolt up fine to the aftermarket downpipe and no you wont have any problems with codes. Only airflow codes I have ever seen were due to aftermarket intakes on stock trucks
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Old 09-25-2013, 05:58 AM
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Good thing I saved the stock intake then.
Thanks Wood
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Old 09-25-2013, 06:22 AM
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that 4" DP needs to have the flange on it for it to fit the stock exhaust.. if it doesn't, depending on the brand DP you have, you'll have to purchase the bottom piece that has the flange on it. Flo-Pro makes one. you'd have to call them up to see if you can order just the bottom piece with the flange.
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Old 09-25-2013, 06:35 AM
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Do you want to sell the dp?
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Old 09-25-2013, 07:02 AM
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He probably had to cut his stock downpipe to get it off.
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Old 09-25-2013, 08:25 AM
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Why are you putting it back to stock? Selling it, or moving to a state that tests emissions?
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Old 09-25-2013, 08:25 AM
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Quote:
Originally Posted by triton022 View Post
Good thing I saved the stock intake then.
Thanks Wood
As p8ntball stated, it has to have the ball style end (same style as the stock) so that it seals to the socket style end of the dpf/cat part. I personally haven't seen anyone with a downpipe on a 6.4 that isn't ball and socket style so I didn't mention it
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Old 09-25-2013, 08:44 AM
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Thanks for all the quick help. Yes I had to cut the original DP. Will check when I get home to see what brand of DP I have and to see what style it is. Removing to sell the truck. Most likely will be posting a intake, exhaust and mini max tuner package for sale in the next few weeks. Just trying to figure out what I need to do. Thanks again, you guys are great.
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Old 09-25-2013, 09:15 AM
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Quote:
Originally Posted by WoodBoy View Post
As p8ntball stated, it has to have the ball style end (same style as the stock) so that it seals to the socket style end of the dpf/cat part. I personally haven't seen anyone with a downpipe on a 6.4 that isn't ball and socket style so I didn't mention it
i had to cut my stock DP out, and my flo-pro 4" DP was 2 pieces and it doesn't have the flange. However, Flo-Pro sells the 2 piece 4" DP with the flange on the bottom half... i just didn't know any different when ordering my exhaust.. if i ever go back to stock when i sell my truck one day.. i'll have to get one with the flange.
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