1999 Subaru Legacy Owner's Manual - Page 288
1999 Subaru Legacy Manual
Page 288 highlights
Starting and operating OM-H2787 J Trailer hitches WARNING Never drill the frame or under-body of your vehicle to install a commercial trailer hitch. If you do, dangerous exhaust gas, water or mud may enter into the passenger compartment through the drilled hole. Exhaust gas contains carbon monoxide, a colorless and odorless gas which is dangerous, or even lethal, if inhaled. Also, drilling the frame or under-body of your vehicle could cause deterioration of strength of your vehicle and cause corrosion around the drilled hole. CAUTION Do not modify the vehicle exhaust system, brake system, or other systems when installing a hitch or other trailer towing equipment. Choose a proper hitch for your vehicle and trailer. The use of genuine SUBARU trailer hitch is recommended. A genuine SUBARU hitches are available from your SUBARU dealer. If use of a non-genuine hitch is unavoidable, be sure the hitch is suited to your vehicle and trailer. Consult with a professional hitch supplier to assist you in choosing an appropriate hitch for your vehicle. Be sure to follow all of the hitch manufacturer's instructions for installation and use. - CONTINUED - 7-57