What’s the Difference between a Cold Air System (CAS) and a Short Ram (SRS)?
In most cases a CAS will out perform a SRS throughout the useable power range. AEM emphasizes developing power in the lower to mid range of the power band, since this is the area of the power band typically used in daily driving. A CAS is typically longer and places the air filter outside of the engine bay to achieve ambient inlet air temperatures. A SRS places the air filter under the hood and uses a shorter inlet pipe than the CAS. In some cases, the SRS is preferred over the CAS due to inlet tract length tuning. The power advantage gained by using the correct diameter and length of tube negates the advantage of cooler inlet air in these cases. In these instances AEM only offers SRS in some cases because there was no advantage to using the CAS. These applications are noted in the search results.
