had mine boosted to 175, and it was still in the si series case, so it bolted into the spirit. should be the same for eagles. if you had two stockers, youd have to figure the mounting, but im betting you could net maybe 150-200 amps cold. but like you see, im gettin right in the middle of that with one. or you could rig in a second boosted for over 300 amps, but unless you have lots of lights, or a big stereo (like me) you would never need it. head to the local small shop, pick up a good delco. youll thank yourself later.