How do I make my headlights shine like new?

To make your headlights shine like new, you have two main paths: restoring your existing headlights or replacing the entire assembly. The right choice depends on your budget and the condition of your current lights.

Path 1: Restoring Your Current Headlights

This is the most cost-effective solution if your headlights are just cloudy or yellowed on the surface. You don't need to worry about the Audi A3 sport price for a new part; a restoration kit is very affordable.

Steps for Headlight Restoration:

1.  Clean & Mask: Thoroughly wash the headlights and the surrounding area. Use painter's tape to mask off the paint around the headlights to protect it.
2.  Sand the Lens: This is the key step. Start with a wet sanding process using a low-grit sandpaper (e.g., 400-600) to remove the heavily oxidized yellow layer. Then, progressively move to higher grits (800, 1000, 1500, 2000, 3000) to smooth out the scratches. Always keep the surface wet.
3.  Polish: Use a plastic polish compound and a buffing pad (you can use a drill attachment for efficiency) to bring back the clarity and shine.
4.  Apply a Sealant/UV Protectant: This is the most critical step to prevent the cloudiness from returning quickly. Apply a high-quality UV-resistant clear coat or sealant from the kit. Without this, the oxidation will come back.

When to Choose Restoration:
Your budget is limited.
The cloudiness is only on the outer lens, and the internal reflectors and components are fine.
You are happy with the stock look and performance.

Path 2: Replacing the Headlight Assembly

If restoration doesn't work, your headlights are damaged, or you want an upgrade, replacement is the best option. This is where your keywords come into play.

A. OEM (Original Equipment Manufacturer) Replacement

This involves buying a new Audi headlight assembly directly from Audi or an OEM supplier. This will give you the exact same look, fit, and performance as your car had when it was new.

Pros: Perfect fitment, guaranteed quality and performance, maintains the original car's look.
Cons: This is the most expensive option. The cost for a new Audi headlight assembly can be high, impacting the overall Audi A3 sport price for maintenance.

B. Aftermarket Replacement with Upgrades

This is where you can dramatically change the look and performance of your car.

Upgrade to LED: If your A3 has older halogen lights, you can replace the entire assembly with one designed for LED. This gives you much brighter, whiter light, better nighttime visibility, and a modern look.
Universal Fit Options: You mentioned 4x6 led headlights. A "4x6" is a common rectangular headlight size often found on trucks and older cars. While not a standard fit for an Audi A3, this keyword is useful for people searching for that specific size. For your Audi, you would need to search for model-specific assemblies (e.g., "Audi A3 LED Headlight Assembly").

When to Choose Replacement:
The headlight lens is cracked or has internal moisture/mold.
The internal reflector is damaged or burnt.
You want a significant upgrade in style and technology (like switching to LED).
A restoration attempt did not yield satisfactory results.

Summary & Recommendation

For a Cheap & Effective Fix: Start with a high-quality headlight restoration kit. If you apply the UV sealant properly, the results can last for years.
For a Guaranteed "Like New" Look: Replace the Audi headlight assembly with an OEM part. This is the most straightforward but costly solution.
For a Modern Look and Better Performance: Upgrade to an aftermarket Audi headlight assembly that is designed with built-in LED technology. This will make your A3 look newer and shine brighter than it ever did from the factory.

Always ensure any new headlight assembly is properly aimed after installation to ensure safety for you and other drivers.