MVC and CMS.OutputFilter

I have a Kentico installation with a custom MVC controller that downloads a file. I have attached the code below. I have verified (by putting this code into a different MVC project) that it works fine. However, in Kentico, the document is unreadable and even file sizes are different. After a couple of hours I managed to determine that commenting out the OutputFilter in the web.config resolved my problem. The question I have is - is there a way to deactivate the output filter for an MVC controller in some way? Obviously removing it entirely is not the appropriate solution. [HttpGet, Authorize] public FileContentResult Download(string id) { var path = @"C:\Windows\TEMP\file.pdf"; if (path != null && System.IO.File.Exists(path)) { string name = Path.GetFileName(path); byte[] data = System.IO.File.ReadAllBytes(path); string contentType = MimeMapping.GetMimeMapping(path); var cd = new ContentDisposition { FileName = name, Inline = true, }; Response.AppendHeader("Content-Disposition", cd.ToString()); return File(data, contentType); } throw new HttpException(404, "File not found"); }