idea for my 4.9
Thread Starter
|
Senior User
Joined: Feb 2002
Posts: 291
Likes: 0
From: Ephrata USA
idea for my 4.9
ok, so i was thinking about what kind of exhaust i want to get this past few monts and i think i haver decided on this set up-
replace everythign from the manifolds back with- a single hihg flow cat instead of the stock 2, then 3 inch pipe to a single inlet dual outlet muffler (havent deciced what brand just yet) then 2.25 pipes out in front of the rear tires on the passenger side with some tips, or something like that. would that be enough back pressure for my engine, would i lose any low end or high end power? thanks.
replace everythign from the manifolds back with- a single hihg flow cat instead of the stock 2, then 3 inch pipe to a single inlet dual outlet muffler (havent deciced what brand just yet) then 2.25 pipes out in front of the rear tires on the passenger side with some tips, or something like that. would that be enough back pressure for my engine, would i lose any low end or high end power? thanks.
New User
Joined: Jun 2003
Posts: 10
Likes: 0
From: SW Iowa
idea for my 4.9
You don't need any backpressure (explained in another thread). I would use a piece of Y pipe and put on dual glass packs. You might consider exiting somewhere besides in front of the wheels, though, because the exaust can stain your rims if you don't keep them clean.
Senior User
Joined: Feb 2003
Posts: 215
Likes: 0
From: The best is the U.S.
idea for my 4.9
Gee, true dual 2.25 inch exhaust turned out in front of the rear wheels is the only thing I would do! I cut right behind the O2 sensor and welded 2.25" pipe to both outlets, ran it through TWO flowmasters and turned it out in FRONT of the rear wheels. I received a significant power gain. This is a 300 cubic inch engine, NOBODY feels that dual 2.25" exhaust for a 302 is too much! This engine needs to breath! My exhaust setup gives me pronounced bursts of exhaust that can be felt by hand 2 feet from the outlet at IDLE. DO NOT LISTEN, Dual 2.25" exhaust IS NOT TOO MUCH! 
Posting Guru
Joined: May 2002
Posts: 1,589
Likes: 1
From: AK
idea for my 4.9
Well the 300 has a totally different powerband than the 302. Its not just displacement we're talking about. You wanna open up the 302 more because its an engine that likes to rev. The 300 makes its power down low and the smaller diameter piping will help keep the power there.
Trending Topics
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
idea for my 4.9
Ak is correct there, the 300 would need smaller pipe to keep the torque curve down low where it needs to be. Using larger pipe won't hurt either, it'll just allow it to rev higher.
Also having the smaller pipe, while keeping the torque up, doesn't have anything to do with backpressure, the exhaust can be 2.25 and completely free flowing. Backpressure isn't what keeps the six's torque.
Also having the smaller pipe, while keeping the torque up, doesn't have anything to do with backpressure, the exhaust can be 2.25 and completely free flowing. Backpressure isn't what keeps the six's torque.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
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
Senior User
Joined: Feb 2003
Posts: 215
Likes: 0
From: The best is the U.S.
idea for my 4.9
My truck must be a miracle then! My bass boat must not know that I altered the torque band and it should be slowing the truck down, but I can't blame my boat because I don't believe I have altered the torque band either. Diesel engines are designed for torque and many come with large diameter single exhaust. As far as low end power, I have seen an INCREASE. "The smaller diameter pipe will help keep the power there" That is true the power will be there but not at the rear wheels. I am currently fabricating a turbo system for my 300 and will be putting it on the dyno for a before and after comparison. For those of you who cannot wait to prove that I am wrong you can pick the weight of the load we will be hauling and put your truck against mine.
Elder User
Joined: Jul 2003
Posts: 997
Likes: 0
From: Weston, Nebraska
idea for my 4.9
I have a 2in. striaght pipe out of my 300 that exits in front of my rear wheel and ends with a 3 1/2 in. tip(pretty loud). But inside the tip where the 2 in comes in about 5in. there are 1/2 in. holes drilled all around the 2in and then a washer welded in the exit of the 2in. then the 3 1/2in. covers this all up. Makes it a little louder without bearly restricting it at all. I get more power out of it. Also hardworkinFORD, dual exhaust in front of the rear tires. How did you do it on the drivers side with a 300. Drive shaft? Gas Tank? Possably 4x4? I've thought about this and it looks hard to do on my 86 4x4 and I'd rather just Y off my 2in. single and go 3in. to the bumper from there, that way it's already restricted or backpressured for your low-end but you still get the sound of the bigger exhaust. This is what I plan to do, b/c gravel from my tires is hell on my exhaust tip, it's all pitted up and chipped now.
Redneck-Cowboy
"Cowboy Up"
Redneck-Cowboy
"Cowboy Up"
Senior User
Joined: Feb 2003
Posts: 215
Likes: 0
From: The best is the U.S.
idea for my 4.9
Bent all the tube as necessary, but I probably brought it around too close behind the transfer case (only left about 4" should have been more). Recently replaced the clutch and it was a tight fit trying to get everything back far enough to change it. Boy it is stout though, it helped me hold the transmission/transfer case up while I wiggled it back in place. Oh yeah, it's a '93 I6 4x4 with a single tank (even though my book says that was not an option for that year). The Flowmasters are turned on their side and tucked up by the frame. Some day I will start my gallery and start putting some pictures on there. Always liked side-exit exhaust and it is practical too (handy for launching the boat and it doesn't collect mud)! If you have any questions feel free to contact me.
Elder User
Joined: Jul 2003
Posts: 997
Likes: 0
From: Weston, Nebraska
idea for my 4.9
Your exhaust in front of the tires doesn't collect mud? I pack it on there like no other (have to scrape it off with a shovel, gets baked on). That doesn't help the look of my tip either. Also is the gas tank still over on the drivers side beside the frame on the 93? Mine is on my 86, thought it wasn't a good idea to have all that heat from the exhaust under the gas tank with no heat sheilds. I'm thinking about running my 2in. right up above the rear pumpkin and putting the Y right there then going 3in. out of the Y to the corners of the back bumper. I like things symetricial or even, just something about me. Any other person would have one side of the exhaust about 3 ft. longer then the other pipe. I just can't stand that, thats why I'm gonna put it right above the pumpkin about 2in. from the bottom of my box so as not to hit the axle.
Redneck-Cowboy
"Cowboy Up"
Redneck-Cowboy
"Cowboy Up"
Senior User
Joined: Feb 2003
Posts: 215
Likes: 0
From: The best is the U.S.
idea for my 4.9
Although FORD literature claims that a '93, styleside, I6, 4x4 regular cab, with the long bed MUST have DUAL tanks my truck did indeed come STOCK with a single gas tank mounted under the bed, centerline near the spare. Therefore no heat near the tank when turning the exhaust out in front of the rear wheels. As far as mud collecting on the pipes of course there is a problem with that but it is not nearly as bad as when it was exiting behind the tires. I sling mud everywhere, not a single inch is sacred! And yes one pipe is longer than the other, but unless you are going to try and tune your exhaust for a given rpm the drawback is only asthetic. In fact the pipe that is about 2 feet longer developes slightly better flow, therefore I believe it is closer to "tuned" than the other. As far as tips getting dirty I solved that by not installing them! Maybe after I complete my bedliner paint job!
Elder User
Joined: Jul 2003
Posts: 997
Likes: 0
From: Weston, Nebraska
idea for my 4.9
Well my tips were just steel anyway, so no big loss, I knew better when I put the pipe there then to put something nice on. That 2in. just looked so small so I got a length of 3 1/2in. so it would look better. Otherwise I see now how you pulled it off, I thought your gas tank was over there on the side.
Redneck-Cowboy
"Cowboy Up"
Redneck-Cowboy
"Cowboy Up"
Junior User
Joined: Mar 2003
Posts: 66
Likes: 0
idea for my 4.9
I have the 4.9 also and I was thinking of going with 2.25" pipe into a single inlet/dual 2.25" outlet Dynomax UltraFlo muffler and sending it straight out the back. Maybe getting a high flow cat if I have money left over. How's does that sound?
How's does that sound?