Manifold, Exhaust LH, for 90~92 ZR-1 LT5. One LH exhaust manifold is required per engine.

NOTE: This is a USED, GM OEM part. GM MSRP is $905.32.  THIS MANIFOLD IS THE ORIGINAL 90-92 DESIGN WITH INTEGRAL CATALYTIC CONVERTOR. 

NOTE: The GM parts manual indicates 90-92 models "now" use the same part number for the RH side as the 93-95 models, BUT make the following statement;

"WHEN USING ON 1990-1992 MDLS REFER TO CHEV SERV BULLETIN 776106 DTD 2-97 FOR ADDITIONAL INFORMATION USE T/W 25129503 CTLC CONV)"

What this means is that Chevrolet no longer stocked the 90-92 RH exhaust manifold with the catalytic converter welded into the manifold.  In order to use the 93-95 design catalytic converter, the 93-95 design RH exhaust manifold also had to be used, as the later 93-95 design had a separate, replacable catalytic converter section that did not require also replacing the exhaust manifold.