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Which zorst / air filter for Cup

K&N do not have a replacement filter available till April. Being that the heat is so high under the lid, is it better to wait for the K&N or go for the induction Kit? What sort of gains (BHP) can I expect form each of them ?

Also, I want a replacement perfomance Stainless Steel zorst (cat back), but not too loud, which is the best suited for this and what sort of gain (BHP) could I expect ?