Help finding a better intake manifold

*****I tried to search but nothing informative came up*****

I’m looking at buying a IS 300 used and boost the horse power N/A before I decide to turbo it. And I was looking at engine specs and I realized how restrictive the intake manifold was. And I can’t find any website’s that sells a supra turbo intake manifold or any other kinda of intake manifolds that would be able to replace the stock and free up some extra pony’s. So could someone please help so I can join your club………..lol….

You would think if they were soooooo restrictive, there would be something available on the aftermarket. Since there isn't, I doubt they are, and you might be wrong. I mean they flow enough to make 700+hp.

Save your money if you're gonna go turbo later. Why spend $1,000 to 2,000 to NA upgrade your car? You'll probably only get 1/4 of the money back selling the stuff anyways. Take that money right now and put it away for the turbo, don't be stupid and waste the money to get 5-20rwhp only.