i like the factrey hood myself and it is retro to the challenger,the shaker does look cool but if no hp gain its a rip off for 2k when you can get a cai from mopar for about 300 or so,i see you can buy just the shaker for about 800 or so but it looks funny without the right hood and that is wher the 2k comes in and you still would have to paint it.i would go with the shaker if there is a hp gain over the cai,i havent found any info on it