How important is it for dynamic sites to submit a Sitemap to google in terms of serp result? Another thing, some of my external links involve php redirection to hide affiliate links, and google doesn't allow this for the Sitemap, is there any way around this? To elaborate, I have links that points to a file internally. but then that files only contains redirection code that redirects externally. Should i just exclude these links from the sitemaps? Thanks