the 2.8L has a lot of room for improvement in the head (as proven by the R32), and the intake manifold isnt ideal if your doing big mods to the motor.
That one looks to be for F/I usage, and note that equal length on the outside, but the intake ports are different on 3 of the cylinders so not really equal length from the valve.
The dual runner intake is proven to make a very big difference to low end torque
Current: '04 Astra SRI Turbo - EDS IPF Flash, 3" TBE, Quaife LSD
Previously: Bora 4mo, cams, coilovers, tune, exhaust, brembo's etc
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