The definition of small engines modifications varies based on a number of aspects. For example, power outputs or fuel consumption.
Some small engine modifications work to increase power independently.
Meaning that you can get one part and leave the other part for later and still notice an engine improvement.
While others will require to be paired with more modifications in order to work.
Each aftermarket modification will provide a different level of tune.
Manufacturers use stage 1, 2 and 3 to show the different levels of improvements that various parts offer.
- Stage 1.
These are bolt on modifications that require you to replace stock parts.
Additionally, they will improve performance for any type of engine. For example, Exhaust pipes.
- Stage 2.
These modifications for small engines work best when they are paired with others.
They do not provide sufficient power by themselves.
- Stage 3.
These are modifications for the truck cars that get regular service.
Such vehicles will usually undergo vigorous machine work when in operation.
Most engines that undergo these stage 3 modifications are involved in racing.
Some of the modifications for small engines include:
Air Filters.

The OEM air filter comes with a lot of restrictions. An air filter is necessary because the engine sucks in a lot of air.
The filter usually eliminates the impurities that are present in that air.
For example, there is dust or dirt that is not good for the fuel combustion.
Replacing the stock air filters with aftermarket filters increases the purity of air sucked into the engine’s combustion chamber.
The engine needs to breath freely.
So, a high flow aftermarket air filter is necessary to improve the engine’s breathing capacity.
Coils.

The car relies on coils in order to start. OEM coils provide 12 Volts which works very well but isn’t enough.
Older vehicles use one coil while newer ones use coil packs.
The coil takes a little power volt and transforms it into larger power.
By knowing what your vehicle uses, you can determine which is the best modification for small engines.
This will optimize the ignition process of your vehicle.
Air Intake.
Air taken in by the car affects the engine’s performance greatly.
If you are using an older car then an intake manifold is the best option, while if you are using a newer model, cold air intakes are the better option.
Exhaust systems.

The exhaust system modifications for small engines is one of the best upgrades to undertake.
Basically the exhaust system upgrade affects the engine’s performance in different ways.
The stock exhaust consists of many curves that restrict the removal of exhaust fumes.
By installing an aftermarket exhaust system, you are able to get rid of these unnecessary curves.
Hence, the engine will get rid of the exhaust fumes more efficiently.
In fact, by getting rid of exhaust fumes, the vehicle’s engine is able to increase power and performance.
This modification for small engines is able to change the sound of your vehicle and make it sound much better.