A lot of guys running the Invidia Gemini with HFC's pair it with CNT HFC's(which I heard are great bang for the buck). For the price of HFC's I'd suggest the Motordyne ART Pipes instead.
I've heard the Motordyne ART Pipes in person paired with the Invidia Gemini(Arnold K), and it sounds fantastic.
Whenever I decide to swap out my stock cats I'll be pairing the motordyne ART Pipes with my Berk CBE.
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