It was requested I post up a note regarding the Invidia Gemini I recently put on the Tree Fiddy.
I love it. We had a few hiccups removing the old system (had to cut 1 bolt on each cat; nuts were rusted solid onto them) and as a result I need to hit an exhaust shop probably monday (not sure if anything’s open tomorrow) and have those two bolts replaced, but otherwise, removal was actually pretty straightforward and install of the new system was even easier.
As with any exhaust, it’s always a good idea to lay everything out and make sure you aren’t missing anything. :giggle: a couple nuts and one bolt short. Lowe’s proved useful for that. 
The primary reason for replacing anything was that the muffler section had rusted away right at the flange where it connects to the previous pipe once already; had it welded up once and it was starting to separate and get loud and drone-tastic once again. My three main choices after hearing in person and plenty of youtube research were the Invidia Gemini, Motordyne TDX, and the Ark Performance. There was a pretty sizeable price gap between the Gemini and the other two. Motordyne was the highest, and frankly sounds the best. But, as I’m selling the Z once I get a few more things sorted out with it, I’m focused more on bang-for-buck stuff.
Haven’t been through any tunnels yet, but the obvious noise of a leaking exhaust is gone. I was, in all honesty, a bit worried driving home from the friend’s house where we did the install, because I caught smoke out the back end and obvious burning smell. Then I recalled that there was a residue inside the pipes and figured it was just that burning off. It went away after a few miles of driving.
No real butt dyno impressions, because it’s an exhaust, and that’s all that’s been done to the engine/car other than wheels/tires and new (OE) brakes. Typically on the 2006, the most common “first” engine modifications are the MREV2 plenum, a spacer, and exhaust, with maybe a K&N filter (the intake itself is actually sought after by those with 03-05Z’s and all non-HR G35’s as a budget upgrade, and an aftermarket intake rarely if ever makes any power; most will cause a power drop over most of the powerband with just a tiny little increase right at peak because they’re poorly designed), and then a tune. Since I’m just doing the exhaust, no tune will be done. So I don’t know if it made power. I wouldn’t be surprised if it did free up a few ponies, but it’s not enough anyone’s gonna notice.
From what I heard of it idling after we got it all installed and I was letting it warm up before getting off the ramps and doing a quick test run, I dig it. Lots.
Anywho.
Back to playing with guns. 
