I ran the bombs with my h pipe.
Didn't drone for me. I'm assuming because I'm geared.
However, they had no tone.
At idle they were loud and deep.
Then, they just got louder.
Did my LTs and changed mufflers
Swapped to flows. Tone throughout the rpm range.
Lost the decibels.
Also, fitment of the pypes left something to be desired. Nothing horrible. But I've ran cheaper axlebacks that fit better..(SSS terminators)
To recap, loved the idle, anything below 50% throttle was deep and heavenly.
For me, just wanted more tone.
Can't speak for power gains before or after my chambered swap.
Felt about the same.
I do miss blipping the throttle around town and watching people jump.