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I used to have on on my GTE worked fine.the only thing was it was heavey on fuel.....all they do is increase the fuel pressure to the injectors..(the oe regulator regs the fuel to a certain psi and the pbv just ups the pressure when needed......
 

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there's no point installing it if you haven't the reason for it. i have one on my 1.4, but my car was under fueling so the uprated Fuel pressure regulator is required. also it needs setting up properly on a Rolling road tune (ideally) where they can check for over and under fueling and also see the performance increases.

and to be honest i feel the fuel consumption has got better, when i first got my car it had 84PS i was doing £15 a week on petrol, now with 128BHP i use £15 a week. using super unleaded
 
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