WMS Dynatech Longtube header testing.

[Intervention]

So it definitely seems that LT's are worth an honest 22-25RWHP. I like honest reviews. Great job!

My car seemed to gain a bit more low end TQ. But with the tests being done on different days, its really hard to tell. That could easily be from more miles or what not

 

[beefcake]

so, i guess my pickup of a .15 can be considered legitimite

 

[Intervention]

so, i guess my pickup of a .15 can be considered legitimite

You have the catted version?

I do, but i doubt it makes any difference in power. Its funny how our cars sound a bit different

 

[beefcake]

You have the catted version?

I do, but i doubt it makes any difference in power. Its funny how our cars sound a bit different

I have a non catted version of the stainless works setup and full exhuast which they dynoe'd at 23 rwhp, and a 41 pound weight savings.

i picked up .15 in track tests before and after and jj said it wasn't a legitimate test of the headers, not like it's a drastic claim or anything, but 20-25 rwhp and 41 pounds off seems about right to me.

i actually picked up .2 but correcting for weather was only .15

i'm just saying since the all mighty unbiased is claiming around 20-25 over a stock catted system, that my stainless works times can be considered legitimate now

 

[JJ@WMS]

So it definitely seems that LT's are worth an honest 22-25RWHP. I like honest reviews. Great job!

My car seemed to gain a bit more low end TQ. But with the tests being done on different days, its really hard to tell. That could easily be from more miles or what not

We gained alot of low end torque as well and can feel the difference for sure. The car pulls real hard and we are happy with the results so far. Track times are next for sure.

so, i guess my pickup of a .15 can be considered legitimite

Legitmate yes but attributed to the headers themselves or the removal of the cats or weight savings is still to be determined. I think cat removal and replacement with a 3 inch O/R pipe is a good gain and then LT's on top of that are as well. I also think they pretty much split it down the middle. say 10hp for the removal of cats and 10hp for the installation of LT's over an O/R pipe. Plus weather conditions play a part in this as well.

I'm not discounting what LT's can do for you, what I am doing it trying to show exactly what the differences are between all of the combinations. If I bolt up the 3 inch O/R pipe to this next car and see similar gains as I did today, or atleast good gains, then that will prove to me that removing the cats and putting in a 3" O/R pipe is a cheaper alternative to LT's and will also be just a tad shy in the HP department of the LT's.

JJ

 

[Intervention]

I have a non catted version of the stainless works setup and full exhuast which they dynoe'd at 23 rwhp, and a 41 pound weight savings.

i picked up .15 in track tests before and after and jj said it wasn't a legitimate test of the headers, not like it's a drastic claim or anything, but 20-25 rwhp and 41 pounds off seems about right to me.

i actually picked up .2 but correcting for weather was only .15

i'm just saying since the all mighty unbiased is claiming around 20-25 over a stock catted system, that my stainless works times can be considered legitimate now

Maybe its the no cats which attributes the difference in how our car sounds...

I dont see how the 20-25RWHP gains can not be considered real/legitimate

 

[beefcake]

We gained alot of low end torque as well and can feel the difference for sure. The car pulls real hard and we are happy with the results so far. Track times are next for sure.



Legitmate yes but attributed to the headers themselves or the removal of the cats or weight savings is still to be determined. I think cat removal and replacement with a 3 inch O/R pipe is a good gain and then LT's on top of that are as well. I also think they pretty much split it down the middle. say 10hp for the removal of cats and 10hp for the installation of LT's over an O/R pipe. Plus weather conditions play a part in this as well.

I'm not discounting what LT's can do for you, what I am doing it trying to show exactly what the differences are between all of the combinations. If I bolt up the 3 inch O/R pipe to this next car and see similar gains as I did today, or atleast good gains, then that will prove to me that removing the cats and putting in a 3" O/R pipe is a cheaper alternative to LT's and will also be just a tad shy in the HP department of the LT's.

JJ

What i'm saying, is the full stainless works system picked me up .15, i didn't say headers only, i said full system, that was my point all along

 

[L.Sanchez]

Nice thread. Alot of good info.

Now help us Cali guys out. I can't go with an O/R pipe. So will these longtubes fit a stock midpipe?? I'm guessing no.

Also, not holding you to anything, but whats your guess in terms of power increase on a car with cats?

 

[JJ@WMS]

I have lots of pictures to sort size and upload as well so stay tuned.

JJ

 

[D98GT]

That is great news...now I just need to hit the state lottery so I can afford a set/installation

 

[wbt]

I will venture to say 7WHP gain. I may have to eat crow. We will see.

I had some crow. 16 vs.7. 9WHP off.

I would love to have seen the comparison against a true O/R x-pipe. Irregardless, great work for the community.

 

[fiveoh]

Maybe its the no cats which attributes the difference in how our car sounds...

I dont see how the 20-25RWHP gains can not be considered real/legitimate

Becuase the cats might be where the real gain is not the headers.

 

[302]

Becuase the cats might be where the real gain is not the headers.

Blasphemy.

 

[JJ@WMS]

Pictures of the Dynatech setup. All high quality hardware, gaskets and clamps.

JJ

 

[RedFire07GT]

Nice job JJ! Always looking out for the customers, +1!

 

[zilla8]

Ok here is my take,

my car made 406rwhp/387rwtq this is with stock manifolds,CAI,HF cats with X-pipe and magnaflow comp series catback and 91oct tune

I'm also in California and LT headers are illegal so I did not go with them.
I say for a street car save your money and put it towards a blower like I did.

with this new 5.0 the stock cats are the real restriction and after changing to the HF cats it really woke this baby up.If I were mainly racing my car I would probably go with Longtubes but for the street the factory headers work just fine.

thanks JJ for all the great info keep it comming.

 

[Tucker]

Great job JJ. I did the same test and picked up 25 RWHP before and after and I used a catted X.

Jay

 

[Mike@PowerHouse]

JJ,
Its good to see an honest comparison. The advertised gains are often times "a bit inflated". I can honestly say that the gains I have seen were a bit less when compared 100% apples to apples.
I tested a major brands set of long tubes, reported them back a true 12 rwhp gain. But my tests are way more stringent than most as engine coolant and oil temps are dead nuts at the beginning of all the pulls (this was a 93 octane tune as well with the stock airbox).
If the motor was cool with the stock stuff, and warm with the long tubes the gains were closer to 5rwhp. If the motor was cool with the long tubes and warm with the stock stuff the gains were closer to the 25, often realized by most.
Our car actually went 1mph faster with the stock exhaust minus the factory muffler than it did with a full longtube/highflow/catback system. 118 vs 117. E.T. isnt a fair camparison being a 6 speed manual car. but the best MPH was also the best e.t @ 11.74.

 

[JJ@WMS]

Thanks Mike.

I did make sure that engine/oil temps were the same on both sets of dyno pulls to keep it as fair a comparison as possible. I am very happy with the results and look forward to doing more testing of other products soon.

Here is a clip of how it sounds during a cold start and some revving up as well.

http://www.youtube.com/watch?v=Iff7YBSdjwM

thanks again,

JJ

 

[SirKnightTG]

in very warm 100* weather.

100 degree weather in winter? Where? Mercury? lol