3.5" vs 4" exhaust - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 16 Old 03-01-2009, 12:38 PM Thread Starter
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3.5" vs 4" exhaust

I have found inexpensive was to straight pipe my stock exhaust. I am gonna see a big difference with that vs a 4" system?

05 F-350 lariat 4x4 crew cab SB
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post #2 of 16 Old 03-01-2009, 12:40 PM
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You should be fine with the 3.5". Most say the big restriction is the cat and muff.

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post #3 of 16 Old 03-01-2009, 12:43 PM
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Yeah straightpiping the stock is definitely the cheapest route, you wont see a real difference if you go with a 4", the mendrel bends and everything are just nicer

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post #4 of 16 Old 03-01-2009, 05:10 PM Thread Starter
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Cool we're talking $100 vs $250 for a 4" kit. I need to be cost effective with the way things are going.

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post #5 of 16 Old 03-01-2009, 05:12 PM
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Id say just go with straightpiping the stock exhaust for now then

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post #6 of 16 Old 03-23-2009, 08:41 PM
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This is the route I am going unless tuning my rig will require 4" system to lower egts!!
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post #7 of 16 Old 03-23-2009, 08:46 PM
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Originally Posted by Matt P View Post
Yeah straightpiping the stock is definitely the cheapest route, you wont see a real difference if you go with a 4", the mendrel bends and everything are just nicer
6.0 are mandrel bent anyways. 3.5 would be just fine for a mild stock mod. The EGTs wont get crazy and would only be a small difference in hp between 3.5 and 4"

What is 100? the muffler delete pipe is $65.00
03-06 Ford 6L Powerstroke Diesel Stock Muffler Delete Pipe


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post #8 of 16 Old 03-24-2009, 06:46 AM
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Oh snap! It doesnt have to be welded?? If thats the case I can do it myself!!

Also, I am getting 150.00 shipped for the muffler and cat delete from that site?? Any cheaper sites to look at?

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post #9 of 16 Old 03-24-2009, 01:27 PM
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Oh snap! It doesnt have to be welded?? If thats the case I can do it myself!!

Also, I am getting 150.00 shipped for the muffler and cat delete from that site?? Any cheaper sites to look at?
Yeah you just have to cut out the stock muffler because thats welded in, then just muffler clamp it in.

The cat is a direct bolt in piece, no cutting. But personally I would just punch out the cat if you are never going to use it again.


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Factory 20s w/ Nitto Trail Grappler 35X12.5X20
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ARP Head Studs
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Isspro Gauges, EGT, Boost, Trans.
20ft of 4" straight pipe!!
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post #10 of 16 Old 03-24-2009, 01:30 PM
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So just gut it and keep the cat housing in place?
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