Either the HFCs or LTH's are the way to go. The heat generated from the SC will eventually burn out your existing cats, and both the HFCs and LTH's will flow better. However, a word of warning - the LTH's are a LOT louder.
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2014 370z Touring Sport Magma Red MT // BP Single Turbo 6467 // 63mm TB's // Z1 Ported Upper Mani // RJM Pedal // Zspeed Stage 3 Clutch // 526 WHP, 451 WTQ
2006 350z (Sold) // 1990 300zx (Sold) // 1985 300zx 2+2 (Sold)
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