JBA Performance Exhaust 1850S-2JS 1 5/8 Header Shorty Stainless Steel 02-2013 GM Truck/SUV 4.8/5.3. JBA Performance Exhaust 1850S-2JS 1 5/8 Header Shorty Stainless Steel 02-2013 G. JBA Racing Headers 1850S-2JS 1 5/8 Shorty Stainless Steel 02-2012 GM Truck. 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.