Boost on stock inlet

**mick08** · 03-13-2011, 01:27 AM

How many PSI are people running with their stock composite Inlet manifolds? What is a safe figure i guess is my question.

**Knight** · 03-13-2011, 06:02 AM

8 psi is the highest most will run. However, the worries usually lie more with the internals.

**Packy** · 03-13-2011, 07:42 AM

The stock LS1/6 intake manifold can hold +20psi easily. There have been many people that have done it. Most people use the LS6 manifold as for it flows better than the LS1 but with them both being made the same I would imagine they can handle around the same amount of pressure.

**mick08** · 03-14-2011, 01:22 AM

Internals will be forged but just thinkin about weather i need to start with an alloy manifold first up or use the LS6 composite one for a while, I plan on runnin twin turbos on an LS1/LS2 depending on which engine comes up first for the right price.

**Packy** · 03-14-2011, 04:33 AM

Originally Posted by mick08

Internals will be forged but just thinkin about weather i need to start with an alloy manifold first up or use the LS6 composite one for a while, I plan on runnin twin turbos on an LS1/LS2 depending on which engine comes up first for the right price.

I think you will be fine with an LS6 composite will work fine or if you wanna then go with a Victor Jr. with an elbow. Most turbo guys end up going that route eventually.

**35th-ANV-SS** · 03-14-2011, 06:42 AM

Cory - Is the FAST intake different material than that of the LS1/LS6 intake?

Just wondering as I thought they were both composite and I've seen FAST intakes blown apart from FI applications, but I've never heard of a LS6 intake tearing apart.

Maybe it wasn't FI, but N2O applications even. I can't remember.

**Packy** · 03-14-2011, 09:42 AM

Originally Posted by 35th-ANV-SS

Cory - Is the FAST intake different material than that of the LS1/LS6 intake?

Just wondering as I thought they were both composite and I've seen FAST intakes blown apart from FI applications, but I've never heard of a LS6 intake tearing apart.

Maybe it wasn't FI, but N2O applications even. I can't remember.

It is made of a similar material I believe. I have never heard of an LS6 intake bursting from boost. I am sure where there is a will there is a way or someone who has done it. Mighty Mouse and others run +20 PSI through the LS6 manifold with no issues. The FAST intake can be used for FI but some of them have burst and other have came apart due to a myraid of things. The thing about a FAST intake is you will not make much more if any more power over an LS6 by using it in an FI application. Some people will argue this but it has been proven a time or two. IMHO save the thousand dollars or so it costs and put it towards a better fuel system or methanol injection and raise the boost level higher.