I decided to do my own review now since the other thread wasn't mine to begin with and was cluttered.
Now a large reason I bought this kit was because everyone has something bad to say about it, yet nobody has any experience with it. I wanted to try the kit out as a t25 replacement, no tune of any kind, just simply bolt it on.
Engine:
S13 Black Top, Stock ECU, Stock MAF, Stock Injectors, Front Mount.
AEM UEGO for monitoring AFR's.
The Kit
ISIS V2 Bottom Mount Turbo Manifold
As other people have said, it looks great. Welds look awesome and appear to have been dremaled smooth on the inside. I initially had fitment issues but it turned out not being related to the manifold (i'll get to this).
ISIS Turbine O2 Housing
As most would expect this looks and fits great, not much more to say really. Welds are again great and have been cleaned up.
ISIS Turbo lines
Turbo lines are great. The fittings are black, the steel braided line is wrapped with a high temp fabric which is black to match. Be careful to keep them off the downpipe and manifold though. Like nearly anything it will melt with direct contact. My coolant line was resting on the down pipe for the first run out and did melt threw the sleeving, no harm done though.
ISIS Intake Kit
The Intake kit is pretty basic, and in my opinion shouldn't be included with the kit. It may work with a 45 degree coupler off the turbo, other wise it's going to need some modification to work. It would be great with a stock t25.
And like it says on the webpage, the kit comes with all gaskets and hardware. The guy I spoke with when ordering the kit was very upfront about the kit, they recommended OEM gaskets as the kit comes with the cheap paper gaskets.
ISIS RS3871 Turbo
The turbo looked great, but its very big. Almost to big to fit, it does squeeze in there.The turbo was actually why the manifold was so hard to fit initially. The wastegate bracket was rubbing the motor mount. It also sits very close to the strut tower, and because of how its clocked makes the coupler hard to fit. I had to trim the coupler and it was still kinked against the strut tower.
After having some issues Ken was nice enough to send me a new turbo to see if it was faulty. I requested a smaller turbo only because of how tight of a fit it was (The issues turned out to be unrelated to the turbo however). He sent me their new turbo. I was told its identical to the GT2871R, only it is journal bearing. If I recall its the RS3371.
The turbo is much smaller, I had 0 issues with getting it to fit. It had plenty of clearance with the strut tower.
Results
The turbo is very quiet. I would say it spools a tad slow, but not to bad. Wastegate is at 9-10psi, and it gets there between 3500-4000. The car has significantly more power than the T25. I don't want to estimate any numbers but it feels really good. My friend has a KA-T, 550cc injectors, tune, and a t3/t4 turbo at 10psi and my setup feels a little quicker.
At WOT the AFR's read in the 11's, seems generally 11.5-11.9. Lowest I've seen is 11.2.
Overall the kit is great. For anyone considering it, I highly recommend it (keep in mind I am using the 3371, which I would hope they start selling soon). Enjuku did a great job in helping me out as well. Like I said they sent me a new turbo with no fuss at all.
I'm going to be rebuilding the engine this fall, I'll try to get some dyno results before and after injectors/tune. This car is drifted regularly so i will also chime in with how well this is holding up.