Camaro/Firebird 85-88 & 89-92 305/350 TPI 52mm or 58mm (select below) BBK Throttle Body, shipping is not included As the originator of the aftermarket performance throttle body, it is no wonder that the world-famous line of BBK Power-Plus Series® Throttle Bodies has become the most complete line with dozens of applications for today's fuel-injected autos, trucks and sport-compact vehicles. Item #BBK-1534 52mm 85-88 305/350 TPI BBK-1536 58mm 85-88 305/350 TPI BBK-1537 52mm 89-92 305/350 TPI BBK-1539 58mm 89-92 305/350 TPI