If you’re looking for auto repair in North Billerica, MA, you’ve found us. Here at R & D Custom Exhaust we work hard to earn your trust and loyalty. We know how important it is to find a North Billerica car service you can rely on, so your satisfaction is our top priority each and every day. If you’re looking for auto repair in North Billerica, MA, you’ve found us. Here at R & D Custom Exhaust we work hard to earn your trust and loyalty. We know how important it is to find a North Billerica car service you can rely on, so your satisfaction is our top priority each and every day.