I've seen Brian from Magnuson post that the overall efficiency of the 1900, especially if you're going for low/mild boost, is a better fit and is a little more efficient down low ( thought I remembered reading it would have as much as something like 30-40 on the 2300). I believe I remembered reading the 1900 is good to 800 horse', too. The 2300 has better
ultimate potential (900+), but there have been great numbers posted with the 1900. They just don't have a 1900 kit for Camaro because there was more of a dominant market for the 2300, on the whole, but there are tuners out there that are using the 1900 with great numbers. I think Magnuson's always pushing a blower that's sized for your application. If you're only looking for 450-500 RWHP, I'm sure they'd suggest a 1900; probably the 2300 for more than 600 RWHP.
Disclaimer: I'm not speaking for Magnuson or Brian. I'm just posting what I remember reading in posts but them, respectively. If they could post in this thread, I know they'd be better at explaining exactly their thoughts
