Hey guys,
Just recently acquired a new exhaust leak on the "exhale". Push the gas, sounds fine, but when I let off... ooo baby listen to that. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt='

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So I'm looking for new exhausts, but wanted to know, how difficult is it to do on my own? What do I need, and more importantly, do I need to do any welding? Looking to do the HKS hyper or the Apexi dual. So based on either of these two exhausts, what kind of work can I expect?
Also did a search, and there is nothing on the actual install of one.