Straight Pipe help
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
if you want cheap ~$50, 3.5" pipe will delete the muffler. If you want better and have the budget for it, a full replacement turbo back 4" will let it breathe better. 5" has no performance benefit over 4" unless you're really crazy with hp mods. mbrp is a popular choice.
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
Yes. If you tow frequently and don't like too much noise, you may want to consider some kind of muffler.
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
I bought a 4" Diamond Eye turbo back for $255 w/ muffler. It made a huge difference with my EGT's.
Trending Topics
Senior User
Joined: Oct 2016
Posts: 215
Likes: 1
From: Near Rockford Illinois
Before you spend some money you may consider
It will be noisy but you can see if you pick up any power. I went 4 inch Turbo Back and noticed no performance improvement.
BBD
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Laughing Gas
Joined: Apr 2016
Posts: 850
Likes: 114
From: Virginia
I say go with 4 inch. That's what I have on my truck, and it sounds really good. I passed a 7.3 with the stock exhaust system with no muffler or cat. At 70mph, it really didn't sound good to me. All I heard was that fluttery sound that 7.3s have. At 70mph, mine with the 4 inch system does have some of that fluttery sound, but it also has a much deeper tone to it with a little whistle. The 4 inch system does drone a bit, but not unbearable for me.
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
I say go with 4 inch. That's what I have on my truck, and it sounds really good. I passed a 7.3 with the stock exhaust system with no muffler or cat. At 70mph, it really didn't sound good to me. All I heard was that fluttery sound that 7.3s have. At 70mph, mine with the 4 inch system does have some of that fluttery sound, but it also has a much deeper tone to it with a little whistle. The 4 inch system does drone a bit, but not unbearable for me.
I will warn you it sounds good like in the video wide open, but going by a guard rail or passing a vehicle in the left lane with the windows down, it does sound kind of fart-can like. I did it to lower my EGTs, not so much sound but the turbo whistle is appealing IMO.
Thread
Thread Starter
Forum
Replies
Last Post
DieselCamper
1987 - 1996 F150 & Larger F-Series Trucks
16
Jun 11, 2016 01:03 PM
old-rodder
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
1
Jun 11, 2013 05:11 PM