I had a Nexus 7 - it wasn't nearly as easy as it seems.. I eventually got it flashed (I think) but it never seemed to be quite as described - the kernel/ROM was hard to find by the time I did it (Timur was out of the game), and was trying to find a way to mount it (had a separate trim piece for it, etc) and it required a lot of guesswork and then the rear diff died (I think) due to a flat tire and no TMPS so I drove that way for 20-30 miles. I've never not noticed a flat before, but that time, I was pre-occupied with a family matter. At that point, I decided it really was time to move on to something else. The Stinger HK sound system is so much better than the LGT, even if it could be better with phone integration, etc.
There is no comparison between the 3.3TT and the EJ, IMHO. I had GST (well regarded Subie shop) install my BNR16g, and the dyno was something like 160 whp on their Mustang dyno stock. After the bnr16g + pump + injectors, IIRC, I was ~220/245 whp/wtq. The Stinger is a few lbs heavier (~3900 lbs instead of 3400-3500), but even stock, it's low 300s whp, high 300s wtq. Like 310/380 (with some getting into the 400s for wtq). That's STOCK, which is already faster than my modded EJ. Stock to stock is no comparison - roughly 2x the power.
With the EJ, adding turbo + injectors + pump + gutted UP/DP, I picked up ~60 whp, maybe 80 ft-lbs (cost: $2-3K+, IIRC)? On the Stinger, just doing intakes + plugs + jb4 (total cost maybe $750), installed in 2-3 hours even for a guy like me who's slow - I would never tackle a turbo install myself - you can pick up like 60 whp / 80 wtq easily. If you're willing to mix E30 (I was already mixing in a bit of E85 for my LGT so yes), that can go to +100 whp / +100 wtq. Lots of guys running 400+ whp / 475+ wtq with that setup. Or nearly twice the power of my "modded" LGT. If you're willing to run WMI (I'm not) and some bolt-ons, it's pretty easy to get close to 500 whp / 600 wtq with a Lap3 tune. On stock block / head. No EJ runs 500 whp / 600 wtq on a stock block. Not even 400/500.
(I've tried not to exaggerate, but I'm sure others will point out any errors I may have made)