• You get guaranteed horsepower giving up to three times more power gains than a standard filter
• You are buying it from the UK #1 online K&N dealer
• Every 57s kit has a million mile warranty
• You never need to buy another one for your car, the kit is easy to clean and once cleaned will perform as good as new
• Comes with a replacement airbox which will reduce noise. Specially designed to offer improved airflow over a standard airbox
• You get a TUV approved quality 57s kit
• Your buying a genuine K&N kit, no ebay fakes here

Easy Installation
Sounds complicated? That’s the great part, these systems are easy to install. A typical installation can be done with a screwdriver, pliers and a ratchet set in 30 minutes. That’s because we specifically engineer the kits to use factory holes and mounting points so they do not require any cutting or drilling. Our 57s airbox is factory preassembled and custom designed for specific vehicles to fit right into the engine compartment.

Guranateed Horsepower
We will not sell a 57s kit that does not provide a measured increase in horsepower and torque (Acceleration). Each kit is proven to increase vehicle power at the wheels. These thoroughly engineered systems provide huge increases in power that a customer should feel when they accelerate. Typical gains on an 4 cylinder vehicle range between 4 and 7 horsepower. We have even tested engines that provide as much as 11 extra horsepower.

TUV Approved
Every K&N 57s Performance Airbox complies with TUV regulations governing emissions and sound levels. Each kit has been submitted for testing and certified before being released for sales. So you have confidence that your 57s will deliver power without any worry about vehicle regulations.

Million Mile Warranty
K&N invented the world’s first air filter guaranteed for one million miles. That same warranty stands behind our 57s Performance Airbox. Engineered with care and passion, these kits are built to last for the life of your car. We stand behind them completely.

57s Specification
57s Performance Airboxes are injection molded from the same materials used in OE air boxes. Once installed, you will have a performance kit with an OE look that looks as good as it performs. A 57s kit comes factory preassembled and has a removable lid to make servicing the washable air filter simple. Inside the 57s is the largest conical shaped High-Flow air filter we could fit into the kit while still using factory holes and mounting points. This extra filter size provides even more airflow at lower restriction than a standard K&N OE replacement filter that is limited to the size of the factory air box. The oversize air filter also captures and holds more dirt increasing the service life before a cleaning is required to 100,000 miles under normal on-highway driving conditions. The air box assembly is connected to the engine with adapters made from high strength materials such as silicon and reinforced nylon that ensures long life. Put all this together and you have the best TUV compliant high-flow intake system available. Stock Check:  ...