I agree they are terrible. I tried them years ago and they added so much back pressure it blew the dipstick out and oil went everywhere. O and slowed the car about 3 tenths.

The dynatech splitfow mufflers are very good. I saw no ET loss with them. The only problem I had with them was it was difficult to hear my car start in the lanes with all the open header cars...lol.


33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage