CAIs are much, much better. TPR is the most powerful overall and is the only Intake
that has zero reliability problems. AEM
has the second best low end, but the least top end. Injen
has the best top end, but actually loses low end (less than stock
). Both AEM
tend to cause bogging (sometimes even CELs), Injen
being much more likely. If you're looking for a cheap CAI
alternative, pick up one of the eBay ones. They're just about exact replicas of AEM
, the only difference being the color and filter, and only cost $50.
If you want the best money can buy, though, get TPR CAI
($180). All of the advantages listed above, plus solid stainless steel construction, adjustable mounting bracket, the best K&N filter out there, and can convert into an SRI
if you're afraid of hydrolocking.