pretty sure there isnt much difference between the 2.8 and 3.2 headers, so thats a whole lot of work for very little gain.
Note that the US cars only have 2x O2 sensors, and the euro/oz have 4. Ecu will likely throw a fault code if they arent in similar positions to stock (one pair before cats, one pair after) unless you have it coded out.
Those aftermarket ones look ok, but hard to guage how much more power one would make, i dont think they are the most restrictive part of the motor. If it was opened up with cams, headwork, ecu, compression etc I would look at doing them however.
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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