Intake manifold

[240TKE128]

So i am working on my ka24e-t build. Shooting for 350whp nothing special, but i am building with room for more in the future, Completely replacing all internals and adding turbo. My question is at what point should i consider taking off the stock intake manifold and replacing it?

My plan was to port and polish it to begin with.

*edit* I have already searched around for some time to this answer. Just cant seem to come across a straight answer. If i can go without replacing it initially it would be a help to my budget but regardless in the future i will be replacing it for the increased flow/hp goals.

Ill go ahead and thank you guys for your opinion in advance.

[ashibah83]

i think around 450 is where you start to see restriction from the factory intake, im sure you could improve your numbers by changing it at a lower level, but i think thats where it starts to hurt you.

[240TKE128]

Alright good so it can be an investment if im able to increase my budget but for now it should work fine.

[martins_240sx]

I changed mine at well above 400hp...xcessive manifold...although now there is a supercharger sitting there so we will see how that goes

[240TKE128]

Yeah my plan was to get the xcessive manifold and get them to do the runner work for me as well. my plan is only 350 whp but i want room for more cause i know once im there ill want more.