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Message: <blockquote data-quote="kevster30" data-source="post: 97480" data-attributes="member: 10">I assume that you are reffering to the ADJUSTABLE fuel regulators that are available in the market.TO answer your question, these work very well if your engine has been heavily modded. These regulators are usually used when you move to larger injector rates or have increased your cubic capacity. They are there to ensure that there is enough fuel pressurised on you fuel rail to meet with the added demands.On a standard car, you will feel a slight improvement in throttle response and that's all. Be warned that they are not easy to set-up, wrong settings will cause loss of power and increased fuel consumption.The standard regulator works fine, leave it well alone as it has been optimally configured to work on the factory set-up.Hope this helps.</blockquote>