RepairPal Certified shops can diagnose and repair your 2000 Jaguar XK8. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
$2,000-$6,000 or more , plus installation , very dependent on quality you want/expect. Locate a 'JASPER' dealer/installer near you and check there.--THEN ask around about the shops reputation.