Okay, now the guy on this Celica site I belong too ports headers for $140 for GT, & $150 + shipping. There is small core charge, but he will send you a ported header, then you will swap, & send him your old one, & get refund on the $40 core charge.

You need more info, I can hit him up. The power gains were impressive from the people who had this done( before & after dyno's showed it). Most had basic CAI, & decent exhaust. You need more info feel free to reply here, or send PM, & I will try to get your question answered. .....Vegeta..P.S Snoozing time now tho. lol