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I posted the same question about 6 mos ago. The big winners were K&N, Mopar and JMB I believe. Maybe AGP also. There's alot of arguement on the topic and everyone has thier point. The Mopar is supposedly the most thoroughly tested. The JMB can be had fully customized to suit you. A lot of people like the K&N. Some say the 3"pipes are better than the 2.5. I think the K&N is the smaller size, don't quote me. Some people like the systems that can be run either short or long. There is battery relocation to consider. The post I did surely didn't help me to decide even though there was a lot of info given. This is something that I wish I could look at for myself, but I do not live anywhere where there are other SRT-4's to look at, much less modded ones. It would be nice if there was a local club or something where you could look at each others cars. I think if it were me, I'd go with the mopar one, but for no other good reason than it's Mopar.
I think it has also been posted if anyone has actually seen dyno proven power gains from a CAI. I don't remember anyone being able to produce any proof.
I got the black and red injen cai from modern performance for $185..Im very satisfied it seems to spool a lil faster and it just sounds cool as ****...(My 2 pennies)