For a really good N/A setup, you gotta do a whole hell of alot more than the basic bolt ons. Tearing down the block, having your crankshaft balanced, forged rods & high compression pistons, possibly bore out the block, get the head ported & polished, titanium valve spring retainers, stainless springs, high performance cams.......I got a price quote of about $4,000 for parts & labor for my H23a. Than on top of that, there are still the bolt ons which you mentioned before(Cam gears, CAI, Headers, catback, wires, ignition, pulleys, fuel rail, upgraded ECU) Depending on what brand of parts you get, this price can vary considerably.