JBA Performance Exhaust 1653S 1 5/8 Header Shorty Stainless Steel 65-73 Mustang 351W. JBA Performance Exhaust 1653S 1 5/8 Header Shorty Stainless Steel 65-73 Mustang. JBA Racing Headers 1653S 1 5/8 Shorty Stainless Steel 65-73 Mustang 351W. JBA shorty headers are one of the best performance upgrades available for any application. Processing begins as soon as an order has been placed, therefore we cannot change, cancel or modify orders once they have been confirmed.