fyi the stock 1.6 injectors are worthless past like 4psi, on my t-25, so you need bigger injectors, upgraded fuel pump, and of course some type of fuel managemt, via a standalone, or a FMU i currently run a rising rate adjustable FMU, and it suits my needs well, dont go with the vortec unit, because there is no real tuning there, with an adjustabe you have alittle bit of tuning, which is better then none.
like i told you on clubprotege, the t-25 is an awesome turbo for the 1.6 litre, but wont yield you the numbers the t-28 will, both turbos have there up's and downs, the t-25 spools insanely fast, i make full boost at like 2k, so i have virtualy no turbo lag, but it does lack the power up high, as shown in my dyno graph i reach peak power at 4k, then it drops off.
http://www.msprotege.com/members/THEGOLDPRO/dyno%20graph.jpg
dont get me wrong it still pulls hard all the way to redline, but from looking at the graph you can see it lacks the top end power.
now if you decide to go with the t-28, you will more then likely not see any power until about 4k, but from 4k and on it will be a beast, so you will lag alot more but have more power uphigh, so its all preference really, i was actualy going to swap in a big t-28 this year, and see how it did, but i dunno i still have to think about it, here is the one i was looking at, it is physically the same turbo as a t-25 just diffrent insides.
http://linux.forcedperformance.net/merchant2/merchant.mv?Screen=PROD&Store_Code=FP&Product_Code=NTDSMFPBIG28&Category_Code=DSM-Turbo
