1) Is is true that an x-pipe is only good on carb. vehicles,and don't make a difference on my 2000 F150 4.6?

2) Is the upper intake on my truck made out of plastic like the currents replacement intakes,or is made of of a diff. material?

 

When the vehicle has single exhaust, an x-pipe isn't needed.

 

Yes, I do know that. I have true dual exhaust, Im talking about efi with dual exhaust

 

I believe it helps low end torque. I know my 2005 Dodge Magnum Hemi has an x-pipe from the factory.

 

An X crossover has no relation to how the motor is feed fuel
It's in the exhaust all after the fact, and works by one bank's pulses help drawing exhaust from the other bank on a timed fire order flow interference basis.
On my 02 4.6L WINDSOR, the intake is a one piece all Aluminum unit.
The only plastic part is the insulated Plenum tuner section that bolts to the bottom and does an IMR volume change type function to improve low and high end power via a motor controller in it's front end..
My 4.6 is a go getter right off the line in stock form with 281,000 miles on it.
Good luck.

 

If you are running true duals, you should use an X-pipe.

 

What makes you say that,and do you have some facts to back it up? I'm def. not trying to be rude at all,I'm just looking for actual facts and not opinions. My local muffler shop said that on only older vehicles with a carb will see a diff with an x pipe,and my local guy said my truck 2000 f150 4.6 ,it would make any diff with an x pipe. I'm just trying to find out if this is really true?