Headers/Exhaust

[Futant]

The headers will make the engine breathe better, allowing more air through it because it’s letting more air out. So this makes it more efficient. Generally when adding a better flowing exhaust, you will lose boost because the engine is working better. But technically you should see an increase in power, causing your horsepower per pound to increase.

So where does torque come into play?

 

[Futant]

When evaluating performance between different exhaust systems in the SC’d Tundra’s the best performance came from a large single exhaust on the stock manifolds and cats. I assume the dumped exhaust was best but that’s just crazy loud and not enjoyable as anything other than a race truck. I had the TRD dual exhaust and went back to a single exhaust which gave me a better launch and made the truck come alive even more.
I understand that we are talking about two different trucks but that’s what I have to go on.
DirtyDeeds in Las Vegas has done some extensive testing from what I can surmise on these SC’d Tundra’s.

 

[ChevyLee]

So where does torque come into play?

It really depends on several different variables. The size of the header tubing, the length of them, and the hellcat motor. We would need to see a dyno sheet to see what really happens I wouldn't use the dyno sheet to look at max power. I would use it to watch the power band. If any low end torque is lost, I don't think it would be noticeable due to the power adder. And if for some crazy reason you could notice a difference, just add more boost lol.

From personal experience on my race truck (which has an LS 6.0), I added long tubes and a short runner intake. I could tell I lost a lot of low end torque but my power band moved up significantly in RPM. I was able to tell this from some street testing. From a dead standstill, if I floored it, I would spin the tires uncontrollably. Then after adding the long tubes and short runner intake, it would spin a little bit off the hit but then as I increased speed and RPM, the tires would break loose.

Hope this helps answer your question. My 2 cents - I wouldn't add headers until im adding more significantly more boost.

 

[Boostedroofer]

Loosing off idle back pressure is only going to benefit you by compensating for boost by increasing RPM band....

Without modification to the heads such as bigger valves or port/polish it would be pointless.

Cylinder pressure = power.

 

[ace32x]

ARH is getting a development truck in next week and is getting working on a 2" primary set of LT's for the trx. We should have an option soon

 

[thewrx]

ARH is getting a development truck in next week and is getting working on a 2" primary set of LT's for the trx. We should have an option soon

And this would be the only set of primaries I would ever run on my vehicles, unless i had mass amount of cash to spend on custom primaries and a burns collector; or maybe if I had a very unique set of exhaust requirements because of turdbo or one off motor/vehicle combo.

ARH makes the best quality exhaust imo, hands down! There mufflers and cat-backs are good build quality but just now getting on par with the other big players in the game. Seems like the "axle-back" setups were an afterthought for them in the past.

I can't wait to see what they come up with, but wish it was before their price increase yesterday....