Here is a thread for Speed Innovations contact information:

https://www.crossfireforum.org/forum...ghlight=SI+ECU

I'm very happy with my SI ECU upgrade and my "Sprint Booster BDD451A" additions.

In my personnel opinion; one compliments the other.

But... It's always best that you make your own decisions, based on the facts presented before you by others, and what makes you happy.