Exhaust
Fleet Mechanic
Joined: Feb 2008
Posts: 1,645
Likes: 4
I'd agree, 4" is plenty big.. That being said I just did a Diamond Eye full 5" SS strait through system; it was a breeze to install (I already had a down pipe installed), I've noticed my EGTs have dropped a noticible ammount and it sounds cool as hell!! Couldn't be happier... I've read some say you loose some bottom w the 5" but I haven't noticed anything seat of the pants...
Fleet Mechanic
Joined: Feb 2008
Posts: 1,645
Likes: 4
No, no problems. I semi-permanently mounted the ball/socket pipe from the down pipe and used rubber bungee cords to dry fit the rest of the system (I had it in/out a couple times). I'd recommend buying some stepped 5" or 4" (if you decide to go that route) SS band clamps insted of using the supplied crude U-clamps; they pinch the pipe and make it difficult to split the system if you need to. You will have to use a few of the supplied clamps because they have adaptors welded to them in order to mount the system to your factory rubber hangers.. I'll be welding mine up except for 1 joint so I can remove it if needed..
Fleet Mechanic
Joined: Feb 2008
Posts: 1,645
Likes: 4
EDIT: two things to note, 1 being that I'm not super keen on the way the tail pipe exits, it's on a 45 and I like the factory look that's closer to if not a 90; and If you think you can get it rebent more power to ya, NO ONE even remotely close to me had a 5" for their mandrel machine... Rose bud and sand I suppose would work.. Second would be I have a 5spd so I don't know if you auto guys would run into any issues further up the pipe that didn't plague me, just FYI...
Trending Topics
Hotshot
Joined: Dec 2005
Posts: 14,377
Likes: 609
From: evansville in
I only have 285s but the 285 spare prob makes the proposition of tailpipe making it even less likely. I would like to see a pic to compare for future reference.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
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
Fleet Mechanic
Joined: Feb 2008
Posts: 1,645
Likes: 4
Gotcha.. Yeah, I'll take a few when I get home around the 21st...
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
From what I read the 5" goes in much better on a 4by4 then on a 2wd. I would love a 5" but I'm afraid to try it, heck, I still think my 3" DP rubs after I've porta powered the firewall two different times now.
Fleet Mechanic
Joined: Feb 2008
Posts: 1,645
Likes: 4
My 3" DP rubs on my bell housing... Oh well...
Fleet Mechanic
Joined: Feb 2008
Posts: 1,645
Likes: 4
I've got a 3" DP and it necks up at the DP ball and socket joint to 5". I had the DP on already but the full 5" systems from Diamond Eye come with 3" DPs..
Cross-Country
Joined: May 2014
Posts: 51
Likes: 0
Good to know i'm not the only one dealing with this... Starting to wonder if it's just a bad harmonic issue with the thin wall down pipes and the way the exhaust comes through the exhaust housing? That stock cobra head down pipe was pretty beefy.
Tuned
Joined: Feb 2011
Posts: 462
Likes: 13
From: Lovettsville, VA
2WD with 235 85 R16s. I have a 5" Diamond Eye now. It was a bear to get in. I'd say with 2WD, you really need to stop at the 4" (unless you want to spend more than 8 hours fighting 4 pieces of exhaust pipe in). But, my spare tire is still in the carrier. Not that it matters much since I discovered the trailer hitch blocks the lowering bolt anyway.
That said, the sound is good.
That said, the sound is good.