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So here it goes- the stock airbox does an excellent job of keeping hot engine bay air out of the intake because it is completely sealed. The only possible way of improving on this design is by using a material that doesn't conduct heat as well. If you look at the design of the Britalman it is clear that the tiny heat shield would do a terrible job of keeping the hot engine bay air out. The Britalman is also not a cold-air intake, so there is no possible way that the Britalman delivers the air nearly as cold as the stock airbox. More than likely, this is why they dynoed the car with an open hood, to eliminate this problem and produce artificial results. So the only way it could have hp gains is if it flowed a ton more efficiently(needs to be a TON because the air is hotter), enough to offset the loss from the hot air. This would require a significant difference in flow, but it is almost impossible that there is that big of a difference between the air filter in the Britalman v. stock air filter. But lets suppose the air filter in the Britalman is just that much better(very unlikely)-then just buy the air filter the Britalman kit uses and put it in the stock airbox to get even greater gains than Britalman.
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