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Hye guys

I am looking to increase my boost. Before I do that I am planning to install a wideband o2 sensor.

As of now I am running stock twins 3in ex walbro 255 pump and stock boost stock injectors. At what point would I need a piggyback/fuel mods and if I need to adjust A/F wouldnt I need to adjust spark? Is there I way to monitor knock sensors?

Also doesnt anyone know the thread size for the pressure side of the fuel line (under the floor board theres a rubber hose with threads on oneside and a banjo bolton the other which goes to the fuel rail) going to the engine
 
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