Every post and page will be forwarded directly to the browser without any correction. The plugin is extremely simple and effective.
Line breaks will not become P elements. Errors in HTML will not be fixed, no correction of Unicode Characters. Quotes, dashes, trademark symbols and so on will stay as they are.
This simple plugin switches all of the filters for your content off. Everything you type will be sent to your visitor's browser. The filters are wp_autop, convert_chars, wptexturize. If you need the same functions not only for posts and pages but also for excerpts or something else, have a look in the source and edit what you need.