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I had a 2 1/2" TTI system with stock manifolds on my 440 Cuda...bad drone, especially at cruise 45-55 mph. I put on TTI 1 7/8" headers no other changes and drone went away. Overall car is probably a little louder with headers, but that annoying drone is gone and I can now cruise in comfort and listen to music if I want to.



Same thing with my 71 'cuda. Healthy 440 with 3" TTI and stock manifolds = bad drone around 45mph. Went with the 1 7/8" headers and the drone is gone. Much more power and sounds 10 times better.

Aaron

68 Roadrunner 383/AT
69 Dart GT Conv. 383/AT
05 Dodge Ram 4x4 Cummins
06 GoManGo R/T Daytona #757
68 Coronet 440