i getting a custom exhaust put in my truck and wondering what diameter pipe to get. i've heard to big takes away torque but i dont want to pay the money and not get some hp. what diameter piping have you guys put on your trucks and how has it performed. i want single in dual out. thanks.

2001 f-150 sc
2wd red
5.4 v8

 

For a stock v8, I wouldn't get anything bigger than stock 2.5". If you plan on modifying it, performance wise, than I would get a 3" pipe. Good luck!!!

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SpliT



2000 Work Series
Deep Wedgewood Blue
Standard Cab 5-Spd
4.2L V6 3.08 Gears
Mean Streak Cat-Back Exhaust(Anyone else have one, I hate mine)
Weld Super Single Wheels
Pioneer Deck DEH-P7200
Tinted Windows
Clear Corners
Superchip
AutoMeter Tach(Not Installed Yet)

Future Mods: FIPK, Bedliner, Billet Grille w/ Painted Grille Surround, Color-Keyed Bumpers, 6.5" Fabtech Ultimate Suspension Lift!!!

Email Me at: F150v6@Aol.com

 

thanks for the info. i plan on puttin jba headers, an airaid air intake and maybe later a superchip. with these mods, do you still recommend the 2.5.

 

I don't think that would be a problem. If you want a louder exhaust system I would go with the 3". Actually now that I think about it, I would get a 3" on v8 with all those mods definitely

 

now is that 3 in and 3 out. when you say 3inches where does the 3 inches start and end. i new at this exhaust thing and i just want to get it right the first time. and what kind of pipe should i get(ie. stainless steel, aluminized, and what gauge. thanks alot i really appreciate your responding.

 

If you can afford it and it's available I would definitely get stainless steel. That way you know that it will never rust and you won't ever have to replace it. If you do the job right the first time, you won't have to re-do it later. Just a thought!

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'98 4.6 5sp. 4x4 ORP (Fully loaded, Power everything).

Mods.
- Modified Air Box
- K&N
- Borla Stainless Steel Exhaust

Future Mods.
- BBK High Performance Throttle body
- Superchip

 

77, the stock exhaust is 2 1/2" at the y where the two head pipes come together. Most of the 3" cat back systems go to 3" behind the y and either a single 3" exhaust pipe or dual 2 1/4 or 2 1/2 exhaust pipes out of a single muffler. Some people have true duals and cut the head pipes behind the cats with a 2 1/2" system on each side. If you do this there needs to be a balance or H pipe installed before the mufflers. This is not a bolt on, out of the box system like the cat backs are. Before you do a lot of changing, think about what you do with your truck. If you do a lot of towing, you don't want to do true duals. If you just want a louder or a better flowing muffler you may just want to change mufflers. With the 5.4 you can go to a 3" system or singal in dual out muffler and not loose any or very little low end.

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98 Nascar Edition, Superchip, Airaid, Flowmaster 70 series, bedliner, in bed tool box, Profile bug deflector and window vents, Class III receiver hitch.