Which cold air intake?
i kno theres a big diff in your 4.6 and my pushrod 5.0, but, i bought a BBK and i could tell a HUGE diff. and thats with a stock throttle body, and maf. most of the people on here like densecharger for the 4.6's, but, i like BBK. they both probably equal the same hp. might wanna look at March's ram-air system too. havent heard much about them, but, they say 15-20hp.
i was also looking into a cold air intake and had mentioned the ram air in the 5.0 forum and im not sure who but i was told that the ram air doesnt start to work until about 100MPH! im not sure if this is true or not but if you know let me know!
you could get a CAI for probably around 200-300 bucks.... or you could save your money and order the GT hi-flow system for $579 from rpmoutlet.com (you would be getting an accufab 75mm t/b and a 75mm intake plenum AND a mac 85mm straight shot intake) that would be a way better investment. this would replace your MAF which is the main restriction on air intake and give you the bigger t/b and plenum which you will really benefit from they say around 35rwhp(thats a lot more significant that 5-10 from a CAI) and every mod that you ever get will be amplified b/c of the already increased air flow. dont get a cai! i am pretty sure that it will work on your cobra-you would have to check with them.
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