I got a set of SRP forged pistons that were designed for a Honda D series
engine, and milled the tops down to match the height of the old pistons.

I picked the lowest compression ones that they had, but in the process I
might of also picked the wrong ones because I wasn't looking at the head
chamber CCs on the Honda engine, which changes the CR of the engine.

What you really want is the piston with the largest volume in the dished
top, not the lowest compression spec from the book. I don't remember
going back and looking to see if there was a better choice, and what I have
now is aprox the same CR as the stock Suzuki pistons were, so not a big deal
but 8.5 would of been better than 9.0, but still a very turbo friendly CR for
up to 10 PSI

Wild

Searching the internet to see what the g16b (16v) head volume is, and found this on the Teamswift website:
"G16B Total Chamber volume = 46.76cc "
Looking at the SRP website, depending on what pistons you chose, the Honda heads are a lot lower in terms of volume,
which would give a lower compression ratio for us.  Just thought I'd share my findings with you.  I have other specs to share later too, but with this compression ratio calculator I'm using online here (and I most certainly may have entered a spec wrong!) I'm getting that with 9.0:1 low comp pistons for the d16Y8 it's bringing our CR down to 7.6:1. I know that sounds too low, because our stock CR pistons are bringing their D16's down to roughly 8.5:1 if I have researched correctly. SO I must have put something in wrong.  But I'm really having fun with this!  I'll run the numbers again soon. 

I think that total volume might include the piston dish volume, not sure

You're right.  I read further down the a thread on the Teamswift website and found that our G16B's Cylinder head volume (not combustion chamber volume, which I thought were one in the same:P) was 25.5cc.  When I put that in, with specs from the SRP website for the low comp. pistons (-11.6cc dish) it gives a 9.13:1 ratio.  On the same subject, I came across a Toyota Yaris engine (1.5L 1NZ-FE for anyone who cares to know:) ), and noticed that their specs were also very similar to ours.  The pistons are 75mm bore, stroke is 84.7mm.  Anywho, the G16B piston height is 28.5mm, with the 1NZ height being 27.6mm. The only hindrance for using these pistons, which would effectively drop our CR down to 8.75:1 (again, if my specs are correct) is that the piston pin diameter is .9mm smaller on the 1NZ piston. G16B piston pin diameter=18.9mm, 1NZ piston pin diameter=18.02mm.  Can a machine shop bore out the pin holes by that much, without negatively affecting the piston? Or is the 8.75:1 CR not really worth the effort?  BTW they make and sell forged 1NZ pistons, which is why I was curious!  Thanks again!

I think you could have the pin hole opened up for the larger pin,
and on a forged piston it would be even better.

If the piston height you listed is the measurement I think it is, that
would be a better piston, as the Honda pistons are too tall, the pin
to crown of the piston is the critical measurement, I had to get the
tops of the SRP pistons I bought milled down so they would not hit
the head