Only way to get a TRD cold air intake is 2nd hand,, its no longer in production.. For the Sportivos the CES CAI is a good choice but expensive at $5XX . For other Corollas 2.5 - 2.75 inch pipe is sufficient . As for gains , there are many experts on this forum and there are also many with own opinions . Hey Rolla & Sao Boy, what cai do you current use for your 03 sportivo?