My setup is working great! By building my Y pipe the way I did, it allows me to step down the pipe diameter and causes a small build up of backpressure near the tail section and cancells out the bad sound pulsation, while keeping a true free-flow path.

 

Does your custom Y pipe go from single 3" to single 2.25" and then dual 2.25" or is it a single 3" to dual 2.25". Because if it is the second one, your a technically not creating backpressure. It would be more free flowing than the 3 incher.

I am glad you are happy with you exaust, i had single straight pipe for awhile and it was too raspy, so I went towards true dual 2.5" bottles. I love it. And the bottles are now burning out so the sound is getting better and better.

 

I have my fabricated to the single 3" inlet into a 2.25" pipe anto a dual 2.25" outlet.

I verymuch enjoy the sound, and have the PCM tuned for this and my other mods and have loved the performance gains!

 

i have 3 inch off the cat-back to a y pipe for 2 2.5's ran out the sides 45 degree angle with 3.5 inch stasinless slash cut tips . it poped a lot when i revd it up but after the brute force it got so deep and doesnt just crackles . i love it

 

I really like my new set up 3in X pipe / super 40 flows turn downs.
It opened the ZZ4 up a lot. Big difference from the old 2.25 hi flow cats / hpipe / flows an all the way out the back.
This thing sounds nasty.