Unfortunately it's the 3" exhaust that's getting you. I've run into the same issue with my car.
I ended up putting 3" high flow magnaflow cats on the collectors of my longtubes and it greatly reduced the sound level in the car, can carry on conversations easily while cruising now. I am also running an Elgin E1839P cam, has a lot of overlap, and the exhaust stank at idle, the cats cleaned it up, don't smell like I mowed the lawn after driving around now.
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*Jeff*
Project Salty - 1964 4 door Malibu, beaten, neglected, red headed foster child
Cammed LQ4 / T56 Swap Project Thread <-click to read! 😁
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