These are exhaust systems from the GMPP catalog.
     Key - gmexhaust
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Description Link
12498617 - Catalyst Back Exhaust System
For use on 1999 - 2002 Chevrolet Monte Carlo; 2000 - 2002 Chevrolet Impala; 1997 - 2002 Pontiac Grand Prix. This replacement exhaust system is constructed with 409 stainless steel tubing and 304 polished stainless steel muffler and tips. Four Inch tips exit under the rear bumper and have adjustable depth to accommodate both stock bumper and “ground effects” kits. Exhaust adds a “throaty” rumble while still maintaining a palatable interior noise level.
(Pic)

12498653 - Dual Exhaust Conversion Kit
This kit is used with P/N 12498617 to convert single exhaust to dual exhaust on Impala, Monte Carlo and Grand Prix.
This kit includes the following items listed by part number quantity and description:
P/N 11515757 - 2 - Bolt-metric heavy hex flange H
P/N 10231659 - 2 - Insulator assembly exhaust pipe hanger
P/N 10301945 - 1 - Bracket, exhaust muffler rear hanger
P/N 88961307 - 1 - Bracket kit, instruction sheet
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