I have the exact setup you are looking at :xgrin:
Tegiwa Intake: Had for 4 years. Quieter than the AEM V2 I had before. Built to a price, as in the weave is super thin, but still looks new. How noisy depends on how you modify your scuttle, and the silicone intake pipe quietens it down a bit. The RRC manifold made it quieter still, don't ask me why.
Skunk2 70mm: Epic noise, not the best fitment out of the box, had to bend the hangers to get it just right. Loud...the supplied silencer quietens it right down but kills power. Had a nasty drone about 4k rpm, sorted with some sound deadening in the spare well, and a vibration dampener just before the rear resonator. Still looks like new after 4 years.
Skunk2 Alpha Header: Replaced the PLM header which was cracking and leaking around flex joints. Gained approx 7bhp from 7400rpm to redline. Fitment was ok, remove oil filter, bend one heat shield slightly, don't use the subframe hanger, use OEM gasket and ditch the crap donut gasket they supply for the EP3 one. Again, looking like new after 2 years.
With all the above dialed in I made 156kW at the wheels, which is about what stock evo10's make in this part of the world. After many hours getting it just right I love it the way it is. It will stay this way until a piston inevitably parts company with the crank :xhaha2: However, it's not my daily. Perfect for a Sunday, don't know if I could live with it every day...