Muffler delete? - Ford Powerstroke Diesel Forum
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post #1 of 24 Old 01-14-2008, 09:59 AM Thread Starter
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Muffler delete?

So, I'm starting to enter the mod world. This weekend I did the DIY Tymar intake, I have gauges, and now I'm ready for the exhaust. I'm looking to improve fuel economy, but the extra power never hurts! I don't have a lot of money right now, so I'm thinking about just doing a muffler delete and leaving the cat on my stock system to let the engine dump the EGTs faster. It seems like the most economical way to achieve the lower EGT/better fuel economy goal. I don't mind it being a little loud, but I don't want to shake my house off the foundation, either. Any comments or suggestions? Would I really see bigger gains if I went to a 4" system, or is it just for looks/sound?
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post #2 of 24 Old 01-14-2008, 10:04 AM
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4 inch lowers egt's and it will sound and and add a few ponies. but u need to have it if u are planning on doing lots of mods

-Josh

2008 2500 LMM- Deleted, Blocked, Fueled, & Tuned by:

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post #3 of 24 Old 01-14-2008, 10:12 AM
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Are you sure you have the cat? Most 7.3's didn't come stock with them unless you were lucky enough or unlucky enough to get one

2002 F-250 4x4 EC, SRW, SB
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DP Tuner F5
ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
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post #4 of 24 Old 01-14-2008, 10:51 AM Thread Starter
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Quote:
Originally Posted by vitalidle View Post
Are you sure you have the cat? Most 7.3's didn't come stock with them unless you were lucky enough or unlucky enough to get one
I don't even know if there's a cat or not! Maybe not-I've never looked for it. I'm not planning on doing too many more mods, just a programmer tune down the road at some point. So will I achieve the same results by dropping the muffler?
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post #5 of 24 Old 01-14-2008, 10:58 AM
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If it is a early 99 im 99% sure it will have mine does. Next problem is do you have the ability or a shop that will do this for you around here couldnt find to remove a cat . Good luck


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post #6 of 24 Old 01-14-2008, 11:10 AM
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well im sure alot of the guys know this its not new to the powerstroke world but just cutting out the muffler doesent lower your egts as much as putting a bigger down pipe (which comes with a 4" turbo back sys) so if i would recomend anything to you it would be to spend the money and get the exhaust done right but i totally understand about the whole not haveing money thing i only have cat back 4" on mine cause it was free lol


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2003 7.3L
Crew Cab Short box
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315/75-16 wild coutry A/T's
Hypertech power programmer 3
T.S 6pos
stock,high idle,50,75,100,140
AFE stage 1
Foil delete
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post #7 of 24 Old 01-14-2008, 11:18 AM
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I deleted the muffler last week, My '01 from NV. has no cat so I'm straightpiped, The added power was immediatly noticeable without the sound getting too obnoxious.
I'll be happy like this for awhile, I had a Navigator with paper plates try to race me, We were even till I let off after noticing the Cop a block up, He got pulled over, Proud of beating me and showing off?

7.3, Auto., 4x4, 6637, Straight Piped Stock Exhaust, WW, Foilgone.
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post #8 of 24 Old 01-14-2008, 11:29 AM Thread Starter
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Quote:
Originally Posted by GoldieStroker944 View Post
well im sure alot of the guys know this its not new to the powerstroke world but just cutting out the muffler doesent lower your egts as much as putting a bigger down pipe (which comes with a 4" turbo back sys) so if i would recomend anything to you it would be to spend the money and get the exhaust done right but i totally understand about the whole not haveing money thing i only have cat back 4" on mine cause it was free lol
But it will help in lowering EGTs? Will it make a difference if it's 4" cat back? If I do the whole thing I should probably just spend a little more and get 4" turbo back, correct?
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post #9 of 24 Old 01-14-2008, 02:13 PM
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I have an early 99. I first cut the cat out and that helped it build boost faster and droped egt 50-100 degrees. I then cut the muffler out and that dropped maybe 25-50 degrees. I used the peices that i had and dumped my exhaust out in front of the duals. I love the sound, not too lound but you sure can here the turbo! I catch myself driving with the passanger window cracked jus to listen to it.
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post #10 of 24 Old 01-14-2008, 02:27 PM
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a ihad an exhaust shop cut the cat and mufler out and weld in a 6 foot chunk of 3.5 inch exhaust pipe. it cost my 50 bucks and was well worth it. but on the side note if your plannng on getting a 4 inch later then dont waste the money on the stock tubing.



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