The ported TB on the LS1 cars makes a definite SOTP difference. It might be bigger on the A4 cars with no little lag or hesitation. Mine is not epoxied but it was still an obvious difference. Not sure about the actual hp difference, but the change in the way the car drives makes it worth it.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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