thats funny i did a set of dsm 450s in my car today....... i wouldnt worry about the install being tough.. i hid the box and ran the wires for the injectors up from the bottom of the intake manifold
and wire loomed everything and it took about an hour.... i also used orings for a 2000 si and the dsms fit perfect....

 

No problem at all. Just shoot me a pm if you have issues and I'll help you out as soon as I can.

Heres a schematic utilizing high tech graphics that will help you out.

 

Good, im glad you went with the 450's i think you will be impressed, just ask us if **** starts going awry.

 

ya im pretty sure it can get the injectors to fit easy enough its the wiring part that i dont like. maybe you could give me some pointers and directions of how u did it