WOW!!! what a difference that made

[Cunningr]

Originally Posted by M9G

There certainly are alot more contributing factors, I once took my ST mondeo to a rolling with a performance cone filter on and was down on power, rolling road guy told me to put original airbox back on with a decent filter which I actually still had in the boot of my car, I put it on and went back on the rolling road and performance went up. So yes a performance filter can have the opposite effect.

One key factor with the more air statement is "cold air"

I watch alot and I mean a lot of American mod programs and I cringe every time I see a beautifully modified car with a cone filter added into the engine bay sucking in lots of hot air

Good point but the engine ecu needs to be tuned in for the mods in many cases, plus if you have more air flowing in and did nothing to the exhaust to get the air out more efficiently.

There certainly is more to it than throwing on air filters and loose exhaust but more air in more air out is the basis of developing more power. Idea is to increase combustion and evacuate gases more efficiently. Hot rodding 101!

[Topless]

I gotta say I am in the skeptical camp here until I see some before and after dyno data. I have been looking at these mods since 2005 and the desnork/hi flow cone filter typically return about 1hp measured. Not enough to feel with the "butt dyno" and likely below the margin of error with a typical Mustang dyno.

Where the placebo effect comes in is by altering the intake and exhaust the car is significantly louder and "seems" a lot faster. Put it on the dyno to test it objectively... bupkis.

Subjective sensation: Louder feels a LOT faster.
Objective before and after dyno test: 1hp maybe

I believe in keeping an open mind so if you want to support a subjective "butt dyno" sensation of power, get her on a real dyno and look at the objective data.