My 2 cent.

I have tried many configuration (on my van and other customers) and ended up
with that (before i went Subaru):
http://www.benplace.com/85rouge/rouge128.jpg

In my case, only the 2.1L exhaust seem to do a tiny difference powerwise.
Still, i did put back the 1.9L exhaust because i had new ones in the shop.

Reason to stay with Digijet/1.9 setup:
-Less expensive exhaust system
-More reliable and simpler FI system
-More Digijet used part available and less expensive.
-Simpler cooling system and way more reliable (less hoses).

2.1L harness are as dry as the older one.

On top, you already have everything install in there. For the difference in
power, it's not worthed.

And i know what i'm talking about.

Good luck, Ben
http://www.benplace.com/