just to add to that, as we know this subject is a very common one, in the Video/Photo section of this forum if you set it to look back for "all" posts or whatever it is, you can find some video clips that I linked to the page from trucks such as ours with a couple diff types of mufflers, granted you will not always know if they are the cat back or custom setups but will also give you sometimes a better idea of how it will sound, in fact i'll do better than that and will place a couple links here for our trucks (again, no idea whether or not they are cat back systems or customs, but they do identify the muffler generally
this first one is of a truck that got wrecked but the guy thinks that his only mods on teh engine were K&N intake and possibly a flowmaster muffler (you'll have to ignore the music but you can still get a get listen to what this truck sounds like, it's pretty mean sounding and it's an N/A 3.3), actually 3 clips of this guy's truck, i really liked the setup he had on it too
http://www.youtube.com/watch?v=ZmlHNUYcb4Y
http://www.youtube.com/watch?v=4Me_VF4dsCM
http://www.youtube.com/watch?v=1tCLnG_11So&mode=related& amp; amp; amp;search=
3.3 with AEM intake and gibson exhaust
http://www.youtube.com/watch?v=njkQpFP2gRI
second, another flowmaster on a 01-04 (not sure what year)
http://www.youtube.com/watch?v=AweO8c7KShM
2005 frontier with bassani cat back (i'm assuming it's a 4.0 but doesn't say)
http://www.youtube.com/watch?v=9MlcdOPXKTI
http://www.youtube.com/watch?v=JITsJFoiBAg&mode=related& amp; amp; amp;search=
2006 4.0L with what says is true dual
http://www.youtube.com/watch?v=svcr58k_yKk&NR=1
another late model with a flowmaster
http://www.youtube.com/watch?v=WBI4m6ev5QQ&mode=related& amp; amp; amp;search=
this one says 2007 Frontier LE with K&N intake and dual exit magnaflow
http://www.youtube.com/watch?v=HNNBgN-KUNk
06 SE with JBA catback and spintech muffler (2 clips, one inside the cab)
http://www.youtube.com/watch?v=KkmkPJdxYU8&mode=related& amp; amp;search=
http://www.youtube.com/watch?v=5He52Z1Xu9g&mode=related& amp; amp;search=
spintech on a 2000 4 cyl fronty
http://www.youtube.com/watch?v=nWsnP_ei6Ks
hope that helps some
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