removing mufflers
Thread Starter
|
Logistics Pro
Joined: Apr 2011
Posts: 4,744
Likes: 5
From: Earth
removing mufflers
Ok I been reading up and determined that based on what I have read that muffler(s) on our Trucks (truck in sig) can possibly cause some restrictions, and does not really help any thing?
How true is this, and how easy can it be removed? I am down the road planing to straight pipe the truck, yes I know it might be a bit louder, that is fine, especially if I can free up some restrictiveness about the exhaust! Anyways truck in question is a E99 7.3L diesel (Stinky Jr.)
How true is this, and how easy can it be removed? I am down the road planing to straight pipe the truck, yes I know it might be a bit louder, that is fine, especially if I can free up some restrictiveness about the exhaust! Anyways truck in question is a E99 7.3L diesel (Stinky Jr.)
Thread Starter
|
Logistics Pro
Joined: Apr 2011
Posts: 4,744
Likes: 5
From: Earth
I remember reading a post on here (can't remember the thread, but I THINK It was one of Tuggly's threads about the engine swap hes doing) that 3.5 is optimal for stock set ups and 4" is good for trucks with mods, I could br wrong but I do recall seeing that info, my truck is bone stock aside from the Stock AIS (it was an "after market" option for this truck) so thats why I was going to just settle for a muffler delete and leave whats there alone (if it aint broken I am not going to fix it...) until I absolutely have to replace the exhaust system...
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
I know what the AIS is. 
Some of the 6.0 guys go with a 3.5 down pipe for fitment reasons and 4" back. I wouldn't go any large than a 4" though.
What do the 7.3L guys do mostly? Probably best to move this thread there.
Some of the 6.0 guys go with a 3.5 down pipe for fitment reasons and 4" back. I wouldn't go any large than a 4" though.
What do the 7.3L guys do mostly? Probably best to move this thread there.
Senior User
Joined: Feb 2015
Posts: 318
Likes: 3
From: Normal
I straight piped my old 7.3 and i thought it sounded good. Didnt really notice any performance gains but for the free price it was well worth it
Trending Topics
FTE Chapter Leader
Joined: May 2006
Posts: 11,273
Likes: 99
From: North Dakota
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I took the whole thing out and went with a 4" turbo back from MBRP (with muffler). I know others get a 3.5" downpipe then 4" from there. I'll tell you that a 4" mandrel bent downpipe b-a-r-e-l-y fits.
The "restriction" on the stock downpipe is not as bad as it looks. If you're looking to just get a muffler to put on your stock system I've read guys going with the Walker Big Truck Muffler and being happy with it:
https://www.ford-trucks.com/forums/9...k-muffler.html
Walker BTM Muffler Walker Big Truck Muffler
Walker Big Truck Muffler 21470
I don't think 3.5" is very restrictive, just the (slight) bends in the exhaust and the baffles/packing in the muffler (didn't cut mine open to inspect it on the way to the recycle bin). 4" is more than enough to pass the exhaust as fast as the engine can spit it out and anything more is overkill IMO unless you just gotta have that 10" exhaust tip.
I will say that the MBRP muffler is very nice. It has a straight-through design and is reversible. Install it arrow towards the back of the truck it's louder and reverse the direction (arrow towards the front of the truck) and it's quieter (similar to a glasspack).
The "restriction" on the stock downpipe is not as bad as it looks. If you're looking to just get a muffler to put on your stock system I've read guys going with the Walker Big Truck Muffler and being happy with it:
https://www.ford-trucks.com/forums/9...k-muffler.html
Walker BTM Muffler Walker Big Truck Muffler
Walker Big Truck Muffler 21470
I don't think 3.5" is very restrictive, just the (slight) bends in the exhaust and the baffles/packing in the muffler (didn't cut mine open to inspect it on the way to the recycle bin). 4" is more than enough to pass the exhaust as fast as the engine can spit it out and anything more is overkill IMO unless you just gotta have that 10" exhaust tip.
I will say that the MBRP muffler is very nice. It has a straight-through design and is reversible. Install it arrow towards the back of the truck it's louder and reverse the direction (arrow towards the front of the truck) and it's quieter (similar to a glasspack).
Thread Starter
|
Logistics Pro
Joined: Apr 2011
Posts: 4,744
Likes: 5
From: Earth
well I was just hoping I could undo a clamp or two rip out what ever muffler is there now, then put the straight pip in its place and reclamp it in place and be done, is the stock exhaust supposed to be 3" if so I suppose that would be ok for keeping it as stock as it is now 
Thread
Thread Starter
Forum
Replies
Last Post
sfgiantsfan9
1999 - 2003 7.3L Power Stroke Diesel
12
Aug 7, 2008 06:43 PM