that's with a 1 faraday Capacitor i had my head lights dimming. (if i held the rpms up at like 4K it wouldn't really dim)
(actually with a True rating its micro faraday but no car audio shop knows they, they just tell you they have 1 or 1/2 farday rated caps) i was thinking of adding a 2nd battery but i ended up tearing out that install to sell the car and get my STI