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Important Notes
Read below before you waste all the BHP you have spent lots of hard earned money on achieving & throw it away on the intake system.

1. Never use Ram pipe sock filters of any type, you will lose between 20 to 60 BHP.

2. Air filters & air boxes are critical in design & should be tested on a dynamometer to prove losses or gains. An air box can reflect the engines natural pulses & give an improvement at some engine speeds & losses at another. But this can change dramatically due to cam profile, timing, exhaust manifold design & shape of air box & an air box that works on one engine spec probably will not work on another e.g. the usual scenario is a gain in torque at low RPM & drop in peak power. Please be warned we have spent Thousands of Pounds on the dynamometer & sometimes got nowhere.

AR-AB2 Air box

3. Your engine works by mixing fuel & air, which is ignited to generate heat to force the piston down generating BHP. The hotter the air is when drawn in to the engine, the less dense it will be which means because it is already partially expanded the less it can expand when ignited, this means your engine is generating less power. So the colder the air you can get in, the better BHP you get out, e.g. for every 10 degrees of air temperature you can loss in the region of 5 BHP (we have recorded over a 100 degree in some intake systems in test). So yet again don't waste that hard gained BHP with a hot intake system.

This air box AR-AB2 was designed as a universal air box and we recommend the use of up to 40mm air horns.  The user would then construct their own flat back plate (suggested out of aluminium) to suit their intake system.  There are 2 stepped back plates available (see pictures below); one at 40mm which will allow you up to 80mm air horns and a 70mm stepped back plate which will allow you up to 110mm air horns, you will then be able to fit either trunking to an air filter or a filter directly to the air box as shown.  As detailed above you will then need to test your installation on a rolling road and fine tune your fuel injection system or carburettors to optimise their settings.

The air boxes are normally only produced in black and made to order, other colours are available at an additional cost.  Please contact for more information.

AR-AB2 Air box with dimensions
AR-AB-P40-&-ARAB-P70 Back plates

AR-AB-P40 Air box back plate 40mm depth (far right)

AR-AB-P70 Air box back plate 70mm depth (near right)

Air box and back plate dimensions

Email received from Jon Crofts who purchased an air box AR-AB2 & back plate AR-AB-P40 for his MK Indy with 2.0L Vauxhall XE engine.

Just a quick note of thanks for the excellent service and expectation setting re my air box & filter.
The product arrived to the day that I was told when I ordered it. The air box not only looks & sounds great but it has also improved performance on the dyno. Furthermore I'm now down to 96db at 4500rpm at 0.5 metres for static testing, a loss of 5 db.

Thanks again. Jon

Jon Crofts engine
AR-AB Air box fitted Air box AR-AB on Andy Bailey's Sylvia Stylus
Air Boxes | Air Filters & back plates
2.0L Vauxhall Kits & Components | 1.6L & 1.4L Vauxhall Kits & Components

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