i have a 07 4x4 Titan. i was told that i have 4 cats on this truck. is this true? if so, could i gut 2 of them with out messing up the truck, and if so which 2 would i gut? my problem is that i don't like the sound that my dual magnaflow exhaust puts out. i want a louder, more aggresive sound. i'm guessing that would help me out a lot. any info on this topic would help me out a lot. sorry if there are a lot of other posts on this topic, but i looked and havn't found all the info i need yet. thanks.