FI hands down. Keep in mind HFC are not legal in CA and will effect your smog tests. People get around it by swapping out OEM cats with HFC when the time comes.
Is it easy to swap them out every now and then? I read some threads and it doesn't really seem like a DIY unless you REALLY know what you're doing.
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308 rwhp | 252 rwtq | Fast Intentions CBE 18" Res | Stillen Gen 3 CAI | EcuTek Tune | Stoptech Slotted Rotors and Sport Pads | KW V3 Coilovers | SPL Upper Control Arms & Lower Rear Arms | Seibon CF TS Hood | Vossen CVT | SPC Toe bolts
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