4.6 Intake Manifolds?

ya the stock will hold fine I did A pi swap in my 97 with a 125 shot, workd great for almost 11 months, now I want more power...go figure

But like "jeffnoel" said get all the bells and whistles, its makes the world of differnce and safety
 
if you want a metal intake on the cheap HPS and Professional Products both have a decently priced alum. lower intake.

The HPS is probly much better quality and is made in the US.

The PP some people have had holes in them from the manu. and saome people are happy with them.

Gains on both are as of yet unproven.