Heads up this should fit 05+ Xterra, even though it's only listed for the Frontiers...

http://store.bankspower.com/Categories.aspx?Category=75b52a99-5ce1-4107-bfed-8a51799b58b4

Just an update on this. I called Banks and they said that the Exhaust will fit on the Xterra. He said however the reason that it is not advertised is because they feel that most people driving SUVs will not want the droaning in the interior. However, he said if you are looking for a purely aggressive sounding vehicle then this may be right for you. The guy said that the average they were seeing on the Frontier was an estimated 0.4-0.5 second drop off of the 0-60 time. I don't know if this is trye but this is what the guy from Banks told me.

Does any one have know what their system sounds like? Because I don't know any one around my way that has any sort of Banks system. Any help would be appreciated. Thanks.

I actually had a cat back on my 04 X and it was painfully annoying inside after the initial bliss wore off. But... I'd still do it again because it still sounds badass outside.
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There was an installation video I saw on youtube for a frontier. I messaged the guy who posted it to see if he has any sound clips. I'll let you know if I hear anything back.

Thanks for the reply. I think I will try and look it up.

Just an update to this.
Here is one installed on a Frontier.

http://www.nissanoffroad.net/messageboard/topic.asp?TOPIC_ID=18649

the banks system isnt going to work. Its designed to be swept to the side for the frontier. All the Exhuasts fro the X go strait back becuase the plastic bumper is in the way of doing a side exit.