TIM Z

iTrader: (12)

Thats 20 psi on the gauge

TIM Z

iTrader: (12)

The y pipe O2 bung drivers side .

George C....

For over 427 cubes and boost look for 2.125 primaries minimal ....they will be custom

DrX

iTrader: (7)

That's why I made the short turn downs off the headers for max effort. The 10.93 pass last year was through full exhaust though(no cats, shifting at 5600).

DrX

iTrader: (7)

Lucky if these ARH's are 2.5" ID at the neck of the collectors.

George C....

way too small for a blown 427

Vortec350ss

iTrader: (20)

While I agree with George about the collectors being too small for you, you can't think of these as a 2.5" collector. That design actually increases velocity as the pipes merge and flows better than something thats just straight 3".

There's a reason some of the better Y pipes out there have this shape:

Atomic

iTrader: (42)

Eh, well, that wont always help. Its a converging diverging nozzle, works fine to increase velocity as long as the flow doesnt start to choke at the throat causing excessive backpressure.

Vortec350ss

iTrader: (20)

Thats true.

Blown06

iTrader: (32)

Those types of merges help with scavenging. No need for that anywhere in a system with a blower. The bigger the better.