K&N drop in filters and silicone post MAF smooth tubes from the Z1 store. Something around $200-$250 and it's roughly 10hp. Lightweight pulleys from Stillen or NST are about $189 and net ~10hp each (nonstackable). Get a used set of Stillen Gen3 intakes here on the forum for around $350-$400 for 17.5hp. Sometimes you can find a used Motordyne intake plenum for about that price, again around 10hp.
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