yeah its normal, duratecs spew out lots of carbon, you should have seen Stazi's SVT on the dyno... I saw a video, there was just a constant flow of black smoke out the back... not THICK black, but rich black.
98 Corolla LE 1.8L DOHC 1ZZFE
TEIN H.Tech Springs
Tokico HP series Struts
Short ram air intake
Tsudo Axel Back Exhaust
... if a jelly fish stung me.. would you pee on the wound?