7M7140 Exhaust Manifold Fits CAT Fits Caterpillar D343One New Aftermarket Replacement Front Exhaust Manifold Fits Caterpillar (Fits CAT) D343 Engine This front exhaust manifold is a direct aftermarket replacement for the Fits Caterpillar D343 engine, routing exhaust gases from the cylinder head to the exhaust system. The D343 was Fits Caterpillar's heavy duty inline six cylinder diesel engine used across a wide range of construction and earthmoving equipment including wheel loaders, scrapers, compactors,