lmcree said:
My exhaust manifold cracked on my '08 Envoy (I-6). any suggestions on a performance aftermarket manifold? Thanks for the help.
On the retail market? Not that I am aware of. Someone was going to make some headers but there wasn't enough interest. But in case you are interested there is a warranty for replacing the exhaust manifold as show below. You need to be within 120,000 miles.
#11150: Special Coverage Adjustment-Exhaust Manifold Warranty Extension - (Jul 25, 2011)
Subject: 11150 - Special Coverage Adjustment - Exhaust Manifold Warranty Extension
Models: 2008-2009 Chevrolet TrailBlazer
2008-2009 GMC Envoy
Equipped with 4.2L Engine (LL8)
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Condition
Some 2008-2009 model year Chevrolet TrailBlazer and GMC Envoy vehicles equipped with a 4.2L engine (LL8), may have a condition in which, over time, may develop a crack in the exhaust manifold. If this were to occur, it could result in increased exhaust noise.
Special Coverage Adjustment
This special coverage covers the condition described above for a period of 10 years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.
Dealers are to replace the exhaust manifold if it is determined to be cracked. The repairs will be made at no charge to the customer.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after July 26, 2011, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to July 26, 2011, must be submitted to the Service Contract provider.
Vehicles Involved
Involved are certain 2008-2009 model year Chevrolet TrailBlazer and GMC Envoy vehicles equipped with a 4.2L engine (LL8).
Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the Applicable Warranties section in the Global Warranty Management system.