Just wondering the 1.4L is already turboed...I'm assuming your trying to turbo your 1.8L with 1.4L parts? The integrated turbo manifold wont fit since the egr valve and hoops clip is in the way. If your trying to turbo your 1.8L you will need Opel/Vauxhall astra VXR turbo manifold which fits perfectly. You will need the 1.8L turbo version ecu and reflash it to communicate to your bcm, tcm, and replace the fuel pump with the opel/Vauxhall version and replace with that fuel pump module. You will also need that version of fuel injectors.i would recommend either hp tuners for custom reflash and tune to pair the euro ecu on your American sonic.the sonic runs a can bus system so the oem sonic 1.8L ECU is paired to your transmission and body control module and your vin is paired....or to save money use the opel/Vauxhall parts and a haltech or mircosquirt standalone ecus to custom pair everything