Beautiful!! How much HP does this add?
Black GT
I would like nothing more than to say that the headers will present you with a measurable horspower increase however;
I am not PT Barnum as such I will share it as it is;
1.They look stunning and IMO complete the look of the engine bay.
2.They are thermal coated by HPC.
3.They are an exact replacement for the OEM cast iron manifolds.
4.They are able to be used with the OEM cats and then any choice of cat back systems such as AccuFab, Heffner, Stillen, etc.
5.There is a cat-less back half system option that sounds phenomenal and is available for the gals with the OEM rear bumper as well as the gals with one of the bumper delete systems.
6.They were created and fabricated out of specific stainless steel materials and an assembly methodology used to insure an extremely long trouble free service unlike typical headers.
7.They will reduce the temperature within that area of the engine bay and the post running radiant heat will be much less.
8.They are relatively easy to integrate and fit perfectly.
9.They are presented with all new hardware that was created /selected specifically for this application with the assistance of folks such as ARP Fasteners.
10.They will change the engine bay noise; meaning tube headers have a unique sound unlike cast iron manifolds.
However;
1.They will "not" create a significant increase in horsepower
2.They are "not" inexpensive
3.They are "not" for everyone however everyone that sees them like them very much.
Certainly I would like to see a set on your gal however knowing that you are at altitude is why you are asking if the potential for horsepower resides with them nixes this particular benefit however all of the other attributes are applicable and I have no doubt that you would like them.
All the best
Shadowman