MAC pro-Chamber...?

I've got the Prochamber w/o Cats with 2 flowmaster 40's mufflers(on stock cat-back) Best sound you can get out of a 4.6

My shop took less then an hour to install the mid-pipe.

Seem to have loss low end torque(less backpressure) but gained alot over 3k.

trap speed.

before-100mph
after- 103mph

nuff said.

I have O/R Prochamber, that i got used on the trader here for $110, with Mac cat-back. I did the prochamber first, noticed little better up top, way better sound, even with the stock muffs. Then did the cat-back. Noticed nothing SOTP-wise but sound was even better. Had them on for over 20K and still leave the radio off all the time, just to listen to the exhaust while driving. Don't get Mac cat-back if your lowering. I put steeda sport springs in and it hits on the axle. I've adjusted them myself the past 3 weekends in a row, to no avail and took it to 3 exhaust shops today, 2 wouldn't touch it because of no cats and other one, a "custom exhaust specialty shop", said there's nothing they can do for me and recommended a borla or BBK cat-back. no money for that.
Cliffnotes: Prochamber Mac cat-back+springs

I have the prochamber and MAC mufflers (2 or 3 chamber don't remember now). The seems deeper than the x pipes I have heard. I have seen dyno results that showed these to produce the best power and torque gains, especially with strokers. This was a comparo done about 3yrs ago, so products may have changed by now. I have no complaints about fitment either.