Typical stage 1 mods are generally a straightforward DIY fit and will work on a standard engine that is in good condition. These are at the bottom end of the tuning scene in terms of the overall benefits you will get.
Whilst other mods can help to raise the power gains and realize the full potential of the mod they are not mandatory. This means that a true stage 1 modification part does not require any other engine modifications to get it to work. Stage 1 modifications added on their own will still work. Let's break this down and fully explain each of the tuning stages.
Well there are some points that one should bear in mind that differentiate between a "typical" mod in each stage. So how do we classify Tuning Stages 1, 2 and 3? So let's cut through these over generalisations of the terms and explain what most car modifiers and tuners would put in each tuning stage. I've even known some companies to offer a "stage 4 or 5 tuning" upgrade! Then we get some working to power figures