Scotty2000SS

Just curious why 1 3/4 headers are an option if 1 7/8 are proven to make more power.

Correct me if I'm wrong

zdeckich

I have seen a 1999/2000 camaro ss gain more power with 1 3/4 and lost power with 1 7/8 in the same day. Now on a boosted car then yes 1 7/8 will make more and more cubs and boost 2in can make more power. All depends on all the variables.

0MarylandSpeed

1 3/4" headers make more low end TQ because the smaller tubes pressurize the exhaust gas faster and get things moving. The 1 7/8" headers make more high end HP because the bigger primary can more efficiently flow the maximum exhaust output of the engine. Header size is all about moving the power band around.

BTW, if you want a great deal on Kooks, call us @ 443-730-9428!

Scotty2000SS

Peak power or power under the curve?

JeremyGSU

Technically, 1 3/4 should make more tq under the curve and 1 7/8 should make more power. However, you're talking about such a small difference there would be little to notice.

I've read countless threads of what people dyno'd on C5 Z's over the last 5 years and the numbers are typically the same between the two. I think under the curve is the only place you might notice a difference.

Scotty2000SS

Exactly, peak numbers sounds like you're splitting hairs. Which one makes more under the curve?

zdeckich

Under the curve.

Scotty2000SS

Thanks! I hear Kooks discontinued their 1 3/4 headers. Must be left over stock! Nice plug lol

Scotty2000SS

Anyone running a stepped header on here?

bikeriderga

1 3/4 = more mid range torque on a bolt on or small cam car.
1 7/8 = more higher end HP and better for HCI changes or aggressive cam based cars.

Not4spd

It's all about matching flow with the planned mods for your car.

Scotty2000SS

Anyone know what size primaries are on the stock exhaust manifold?

grantv

Just measured my Z manifolds in my garage. It's a double-D port shape; the inside measurements are 1 3/8 x 1 3/4" long. That works out to 2.00 square inches inside. A 1 3/4" diameter header inside area is 2.09 square inches, a 1 7/8" header would be 2.42 square inches inside.

Scotty2000SS

Thanks for doing that. I've been told that the LG super pros that are 1 3/4 stepped to 1 7/8 are the best header by far. I also see ARH is making 2" headers now but I see fitment issues with that...