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  • Writer's pictureCrisp Tuning

Performance Upgrades

Updated: Jun 11, 2018


Standard exhaust systems can have a detrimental effect to your engines performance. This can be due to emissions regulations , noise restrictions or even manufacturing cost as well as being under spec'd as you increase the power of your engine.

Its vitally important to choose the correct exhaust design ​to suit you application ! There's a real science to the sizing of exhausts and you can even manipulate your peak power areas and power bands through a manifold alone.

Crisp Tuning are dealers for Milltek, Scorpion, HKS and Akrapovic exhaust and we can even fabricate custom systems for one off applications and engine conversions.

For our full range of systems, visit

Turbo Manifolds

Just from fitting a manifold we have seen anything up to a 15% gain in

BHP and torque. Spool time can be 400rpm quicker and peak

power is held anything up to 600rpm longer, so not only do you

get the extra gains in performance, your power band is also increased!

NA Manifolds

High flow, light weight tubular manifolds are one of the best modifications

you can do to a naturally aspirated engine.

Whether its a 4-1 or a 4-2-1  we can advise and supply you with

what best suits your needs.


Turbo charged engines need to be able to breathe. High powered

applications have increased heat and volume in the exhaust, to enable

an improvement in performance you need to reduce the back pressure

and this is achieved by adjusting the diameter accordingly.


Want a little more power from your car? A cat-back exhaust is the perfect

compromise, leaving the factory catalysts (where fitted) in place and

bolting one of our cat-back exhausts on that are designed for improved

gasflow and sound, but leave the car fully road legal and MOT ready.

Turbo Chargers

A turbocharger uses an engine’s wasted exhaust gas to drive a turbine wheel at speeds up to 280,000 rpm.

The turbine wheel is connected by a shaft to a compressor wheel and the two wheels turn together to suck in and compress large amounts of ambient air. This air is very dense and very hot, so it is passed through a charge-air cooler, where it cools and gains even higher density before entering the engine. The presence of this compressed air makes the fuel burn more efficiently, delivering greater power while consuming less energy.

As a result, more power can be generated from smaller displacement engines – and ultimately this means better fuel efficiency. Increasingly, turbos are coupled with high pressure fuel injection systems, which makes for even more thorough, efficient and cleaner combustion.

Although the underlying concept of turbocharging is simple, its application is extremely complex.

In a wastegate turbo, an actuator is used to open and close a by-pass valve to divert exhaust gas. This ability to restrict the amount of gas reaching the turbine makes it possible to regulate boost by controlling the rotating speed of the compressor.

Induction Kits

Induction kits are probably one of the most popular modifications. An induction kit is quite simply an air filter. Most cars have air filters mounted in an air box. These filters are generally constructed of paper which filters out the particles from the air and prevents these from getting into the engine.

The air boxes are designed to reduce the noise of the engine and have various vanes and angles cut to maximise this noise reduction. Because the air is not flowing freely through the filter there is potentially a loss of power due to the turbulence caused by all that sound deadening.

To make up for this loss of power the air filter surface area is a lot larger than the intake tubes so manufactures have effectively closed the gap between, noise reduction and performance.

Why use foam filters over cotton filters?

Nearly all cars now come fitted as standard with a paper type air filter, why ? Well mostly owing to the costs of a paper filter, it’s very inexpensive to produce & let’s not forget, cars are produced in their millions – so every penny saved boosts profits.

The most obvious disadvantage with paper, is that the filter media is just that, paper. As we all know, paper does not like to be exposed to water / humidity. The instant that the paper media becomes damp it’s efficiency as an air filter reduces drastically. Yet RamAirs’ Aeriform material is unaffected by moisture – namely owing to it’s unique polymer oil. All RamAir filters carry a limited lifetime warranty , which means that they are guaranteed against manufacturing defects for as long as the original purchaser owns the vehicle.

All RamAir filters are manufactured using Aeriform technology which means that every single air filter has variable stage air filtration. Each filter is constructed in two or three different grades of foam to ensure maximum air filtration, unlike cotton/gauze filters. Cotton air filters have only one grade of filter media, which means that once this becomes contaminated with particulates the air flow quickly deteriorates. Laboratory tests have proven that RamAirs’ Aeriform filter media will outlast all cotton gauze filters.

​For our full range of systems, visit

Please call us on 01924 377127 for more details and prices

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