WOW!!! what a difference that made

[SMK Shoe]

I desnorkeled mine a couple weeks ago when a friend and I were detailing our cars. Don't know if it added any perceived performance gains but it does sound throatier and seems to have a quicker response.

[Geof3]

Yeah, K&N isn’t the best idea for these cars. I’m with the rest. Mine had one and the intake was a mess. Doesn’t take much to over oil them. I pulled mine, put in a stock Porsche filter and never looked back. Car still sounds great.

[Quadcammer]

almost 100% from the higher octane gas.

[Finnegan]

Originally Posted by M9G

Recently de-snorkeled my boxster and did the exhaust mod.

Today i fitted a K&N air filter and for the first time since i've had her i put some fuel in her, i put in super unleaded which is 97RON and put in the fuel tank some Redex fuel system cleaner.

OMG!!!!! what a difference now to when i first got her two weeks ago, theres a huge difference in acceleration and throttle response.

I would definately recommend this to anyone who hasnt already done it.

Anyway just thought i would share my excitement :-)

Which exhaust mod?

[Smallblock454]

Louder exhaust and intake noises make your car feel much faster.

But the important part is that you are happy with your mods.

[M9G]

Originally Posted by Smallblock454

Louder exhaust and intake noises make your car feel much faster.

But the important part is that you are happy with your mods.

Ill say the same to you as I said to the others saying the same thing, go back and read my comments in full before you feel the need to comment and you might have noticed I never quoted any BHP/TORQUE gains and the difference has more than likely come from the higher octane fuel

[maytag]

Blue62, I think you're just being purposely contrary.
Which person with "limited automotive knowledge" is going to port and polish an intake, but do it improperly, because they read this forum?

And your whole knock sensor scenario is full of holes as well. Heat is the enemy, but more air in / more air out doesn't generate more heat "in a vacuum". It generates more heat because you're (hopefully) increasing cylinder pressure. That increased cylinder pressure equals more more power. If you're getting detonation, you need better fuel, not less air.

Yes: more air in / more air out DOES equal more power.

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[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

[maytag]

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

You're right, but it's the same thing. Cold air is more dense than hot air, and that's why it matters. If you've got a liter of hot air, it has less oxygen than a liter of cold air. Less oxygen = lower cylinder pressure.

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[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.