Good and bad Performance mod help please

I have been searching around and do not see much on headers here. Are they worth it? What makes a good or bad header? i will also be doing the exhaust with 2.5" piping and most likely with a magnaflow exhaust. is the tubing a good size? Will I see a good gain out of this or am i wasting time? I have a 2006 4x4 dual cab v6 4.0. what other preformance items would you recommend?

 

For headers, most go with Doug thorley long tubes. I think any exhaust swap is more for looks and sound than anything else so in my opinion a waste of time.

For performance, get a supercharger in and call it a day.

 

what makes a good header tho? And supercharger would be a nice touch, possibly after i lift and tires and suspension tho.

 

Less restriction in the air flow and properly adjusts the back pressure to help make the engine run at optimum performance. Long tube for high end power short tube for low end power

 

doug thorley seems to be popular...... as above, long tubes for top end (u will lose some low end tq). short tubes will retain low end tq, and also require u to weld the oem cats to the headers and retain emissions.

whats ur budget?

I have about 2k simply from the headers to the tailpipe..... ya gotta give us a number.

good gain out of a .25" exhaust tube difference? I dont know.
U may be fine just getting a new non chambered muffler welded in.

as the Mayor referred, the blower is a nice mod

 

URD will be rolling out with their own new SPEC-U equal length headers, in about a month. I think...

They are reported to increase low end wtq a nice bit over the DTLT's.

Something to keep an eye out for. There is actually a picture posted on XRU.

 

Here is the pic.

 

That's just the opposite.

Long tube headers enhance low end torque, while short tube headers add more high end horsepower.

These URD's used a similar folding style to LCE so as to get all of the tubes the same length. This is a tuning advantage over the DT short tubes.



...while LCE folded all of the tubes to squeeze a long tube header into the same space as a short tube header.



I know for a fact that long tubes add more low end torque, because this header both raised the amount of torque while lowering the torque peak by 650 rpm on the dyno.

 

Awesome

 

Makes me wonder why LCE didn't make them a Tri-Y header?

 

I'll guess limited available space. To do a proper long tube tri Y...



...would negate a bolt on fit to the stock exhaust system.

 

Your right Ghost Long tubes will increase your top end which is horse power and might loose a little trq down low.

I know this for a fact. I have a 11sec ford lightning and when I installed long tubes I felt a lost in in trq but notice a big difference up top. Also if you are forced induction you will loose a pound or 2 of boost.

Long tubes is the way to go period.

 

Well, there ya go. Two completely different views. It's like the old Miller Light commercials.

Tastes great!... Less filling!

(AutoAnything... they sell headers)

Short or Long Tube Headers?

"For a variety of reasons that involve physics, it turns out that long tube headers do a better job expelling your exhaust at low and medium speed RPM. So, this means you get more horsepower and torque when you're taking off from a standing start or fairly low cruising speed.

On the other side of the coin, shorty headers can deliver more power when your tach is running at its upper end and this is accompanied by less power at low to medium RPMs when compared to long tubes."

 

I always thought longs would aid in low end also..... But every post I seen about them (thorleys) said they cost low end tq, I assumed it was due to the deleting of the cats.

I dunno..... All I can say is I hated driving the truck with longtubes, y pipe, and 3" exhaust before the blower. Truck felt gutless on the low end by a large margin.... So much that I was on the phone the next business day ordering the blower.

 

Annnnnnnnnnd gained it all back.

 

Very much so...... Def don't regret the ordeal now..... At least I can give real world trial and error stories now.

Oh, and good morning.

 

That's because opening up the exhaust in a normally aspirated engine kills the low end torque.

I had exactly the same experience you had when I put a straight through aftermarket muffler on mine. Thank God I didn't throw the stock muffler away yet. I reinstalled it within the week and got the low end torque back. So I was totally pleased when the dyno results showed a nice fat torque peak at only 2,900 rpm. This is 900 rpms lower than the stock torque peak. That's what I want... a truck that pulls at very low rpms like a tractor.

I think that both long and short tube headers can add both torque and horsepower, it's just a matter of choosing which one that you want the most of. As far as I'm concerned, in a truck I only want as much low rpm torque as I can get. Fuk high end horsepower, I almost never wind the engine over 3,000 rpm anyways.

As I understand it, exhaust pulse frequency is very slow at low rpms, so you want long tubes keep the pulses separated for a longer distance before they combine to form the interference that will favor scavenging in a useable rpm range which is low.

At high rpms the exhaust pulse frequency is way faster, so you want the rapid pulses to combine closer to the engine with short tubes so that they will still create a scavenging effect in a useable rpm range which is high.

Greg

 

Are they 304 SS?

 

That I do not know for certain, yet.

 

They look like they might be ceramic coated like the LCE's, except a different color. Sure are nicely built.
I think they're really neato... and I'd love to see URD do before and after dyno runs.