I have the PE installed and had the 2ndary cats removed. After couple weeks of the PE install the sound settle and became slightly more quiet. I then decided to have the secondary cats removed which help bring the PE back to life. I had this setup for about 7 years now...lol Btw also have AA tune in case of any faults from having the cats removed. This have been discussed in other threads. If you have any question just hit me up. Still get pop and gurgles not sure if this your cup of tea.
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