I'm probably going to get flamed for this, but in your original post you mentioned buying headers to help with towing/mileage. I'd ditch that idea personally. I tow all the time with my 100 and have had no issues. I don't think you're going to feel the minimal power gain you'll get from headers and there have been numerous accounts of DT headers cracking. I wouldn't open up that can of worms, but that's just my opinion.
