Verdict: 
I also put my Dr. Gas X-pipe back on (normally I only put it on for track days).
Compared to the MAC cat-back and catted H-pipe, it's quieter at idle, and maybe 10-20% louder at half throttle, and 50% louder at WOT. Got a nice scream to it
.
Compared to the MAC cat-back and Dr. Gas X-pipe, it's much, much quieter at idle, much quieter at half throttle, and quieter at WOT.
How's that for subjective?
No more "hammering" effect from the X-pipe and chambered mufflers, it sounds very smooth, higher tone than an H-pipe, but quite nice. I think I'll run this combo for daily driving.
I wasn't impressed with fitment, though. I'm going to have to swing by the local muffler shop and have them refit the tips for me, maybe have to bend the tail pipes just a tad, and then weld all the segments together (they're clamped now). It's only money.
Also, I don't know how much I like the 3.5" tips. I could be just as happy with 2.5" tips. Who knows, if I can find some chrome 2.5" tips I may swap them out
.
Dave
I also put my Dr. Gas X-pipe back on (normally I only put it on for track days).
Compared to the MAC cat-back and catted H-pipe, it's quieter at idle, and maybe 10-20% louder at half throttle, and 50% louder at WOT. Got a nice scream to it
Compared to the MAC cat-back and Dr. Gas X-pipe, it's much, much quieter at idle, much quieter at half throttle, and quieter at WOT.
How's that for subjective?

No more "hammering" effect from the X-pipe and chambered mufflers, it sounds very smooth, higher tone than an H-pipe, but quite nice. I think I'll run this combo for daily driving.
I wasn't impressed with fitment, though. I'm going to have to swing by the local muffler shop and have them refit the tips for me, maybe have to bend the tail pipes just a tad, and then weld all the segments together (they're clamped now). It's only money.
Also, I don't know how much I like the 3.5" tips. I could be just as happy with 2.5" tips. Who knows, if I can find some chrome 2.5" tips I may swap them out
Dave

