289 pipes. LOUD! What can be done?

[brewha]

I was just like you with my 331 with high compression heads. I used Car Chemistry 2 disk inserts in the end of the side pipes. They sell them at Summitt. The are pressed in (or hit in with a rubber mallet) and then held in with a single stainless steel rivet. I did not weld the optional end cap on. It helped a lot. At normal driving, the drone is gone and I can now have conversations in the car without yelling. I had bought steel wool packing to put between the inserts disk but wanted to hear it first without it. I wish I had placed the steel wool in now as now it will not be as easy to do it. I am very happy with the results. IMG_0398.jpg

[OttawaFFRer]

I was just like you with my 331 with high compression heads. I used Car Chemistry 2 disk inserts in the end of the side pipes. They sell them at Summitt. The are pressed in (or hit in with a rubber mallet) and then held in with a single stainless steel rivet. I did not weld the optional end cap on. It helped a lot. At normal driving, the drone is gone and I can now have conversations in the car without yelling. I had bought steel wool packing to put between the inserts disk but wanted to hear it first without it. I wish I had placed the steel wool in now as now it will not be as easy to do it. I am very happy with the results. IMG_0398.jpg

Thanks brewha. I was just looking at these. They have an option to attach to the header flange which would give me another 1/4 inch of clearance. I was going to need a spacer anyway. I think I'll give them a try.

scratch that, the flange is 3 bolt. Will go with the pressed in option.