Re: Exhaust/ Intake for a EF or EL
The I6 EL responds very good to small exhaust and inlet changes.
Throw on some extractors and a 2.5" system.
On the inlet side, don't bother with any fancy (wanky) CAI setup as the standard air box set up flows quite well. All you need to do is fit a decent filter, whether that be a new standard, or K&N or whatever, and then grab a EF XR8 snorkel from Ford, they are around $45 and this will give you as much flow as you need.
4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?