what's the most boost can a fast plastic intake Handel I was told up to 40 psi I am looking to run a three bar map up to 30 but probably looking to run 25 max

 

fairly sure thats just an Ad bot but to answer your question and ask one of my own....

I dont know if people have taken them to 25psi but mine is holding at 16psi, there is another guy who just posted about problems at 16psi. If you search FAST intake in this section you should get some more answers.

Now my question...what are the specs on your engine build? Got any pics?

 

Still working with 16psi .....but don't know whats going on with it
https://ls1tech.com/forums/forced-in...cs-inside.html

 

no I don't have it yet I had a bog block turbo mustang and want to put a 422 LSX in it but want to keep it a flat hood them sheet metal intakes are pricey so I was wondering if the fast can Handel it

 

Run the LS2. Problem solved.

 

I have ran 18 psi through my FAST with no problems at all.

 

what is it about the ls2 that makes it better than a fast?

 

Under boost, there's no need for a fast which would reduce the risk of blowing one up 100%.

 

You can always add the burst discs if you do run the FAST to avoid disaster to the manifold and your wallet.

 

The newer FAST 92mm intake manifold has a lot of upgrades over the old FAST 90mm intake manifold. I have not heard how the 92mm intake is holding up, the 90mm intake gave some people problems with boost leakage.
With boost the LS6 outperforms the LS1 intake manifold, I would think the FAST 92mm intake would show good gains over the LS2 intake manifold. Bob