Lower intake

No aftermarket lower will fit the stock PI upper.

Wait until next year when the TF manifold is "supposed" to be released. It looks promising at the moment, if it ever gets to market.

heads are more restrictive than the stock PI manifold. also longtubes and a tune will pick up 30hp or so.

Kenne Bell makes a nice lower intake...the upper part is pretty nice too! ;-)

haha yea right now kenne bell LMAO for 4,100 base. Yea alot of people would be interested in that!

RoadconeTuning said:

heads are more restrictive than the stock PI manifold. also longtubes and a tune will pick up 30hp or so.

Click to expand...

Can anyone else confirm this? I was under the impression (nothing factual) there was a big bottleneck at the lower intake level...

Thanks.

There are at least 10 different intake manifolds that were available for the 4.6 2 valves that I know of.

Typhoon - Professional Products (junk)
Reichard Racing
Bullitt
P-51 - Fox Lake
Logan Motorsports
Hogan Sheet Metal (must rob bank)
Edelbrock (out soon?)
Trick Flow (out soon?)
Wilson Manifolds (must rob bank)
VRI

Like SanMan mentioned most of these either eliminate the need for the upper plenum or use their own. The Typhoon is the only one that will use the stock type plenum, but after seeing a few of teh Typhoons and their terrible casting, I would never persoanlly use one even if it did show power gains. The Logan Motorsports is going on my car later this year. It is less than a grand and has proven to perform very well.

It's not necessarily how the heads and intake manifold flow independantly, it's how they flow together. Whenever you flow test a cylinder head with the intake manfold bolted to it, the flow numbers will always be less than when the head is flowed by itself. It's all about optimizing them to work together.