K&N Drop-In

[snickle]

I put a K&N in the other day. Definately improves flow. You can hear the intake more now. Now if I can just scrap up enough cash for the Borla exhaust.

[Rev.Hammer]

Puuuure Sugar!!

[davidl13]

yea, i put the DROP in K&N and I seem to be getting better gas milage as well...

it is a little too soon to tell, but at first glance my MPG went FROM 15 avg to 17 avg...

[threefortyduster]

dont forget that airaid has an intake system out...heres how it looks installed...i'm offering it to forum membesr for $152 plus actual shipping.

[BrilliantBlackHemi]

I noticed during an inspection with JoeKD at the Kart Meet, that the intake tube between the air box and throttle body appears to be smooth inside and does not follow the accordian and ribbed pattern that you see on the outside. With that in mind, is there any reason to change that out, e.g. the 360 Intakes unit, except maybe to have something painted to match the car and for a coolness factor?

Otherwise, the Airraid unit looks to be all you would need. Unless there is a restriction issue with the air as it comes through the fender and INTO the bottom of the stock air box.

[billapex]

Here's my post FROM elsewhere in this site:
"OK, I just went outside and did a little "gnarly R&D" on the stock air intake setup. The fresh air snorkel underneath the airbox looks to be about 3.25-3.5" in average overall diameter and pulls air FROM the fenderwell. I don't think you'd gain much hp FROM removing it.
The stock airbox itself is very large and uses a pretty large filter. I don't think using a cone-style filter would net you much hp, as the overall filtering area wouldn't be that much larger, if any larger at all. FROM the pictures of the available aftermarket air intakes, the filters are shorter in length than the stock fitler, but, if cut in half, would be slighly wider than the stock filter. A wash in filtering area over a replacement air filter? My guess is would be close.
The intake tube FROM the airbox to the throttle body is 3.5" throughout and is fairly smooth inside except for the few rows of accordian-style ribs to keep the tube attached under WOT (wide open throttle) and engine torquing. I don't think those ribs are going to hurt airflow significantly, especially with the tubing at 3.5" in diameter.
I couldn't get my dial calipers in there too easily, but the throttle body looks to measure about 75mm, maybe even 80mm. Either is plenty large for a 5.7L engine. (At the performance shop I used to own, we'd use 75mm throttle bodies on 5.0-5.8L Mustangs with superchargers, and going to an 80mm TB wouldn't net any more hp.)
So, it looks like DC has done its homework with the air intake setup. The 360 Airintakez kit uses a 4" tube FROM the air filter to the throttle body. While I don't think that hurts anything, I wonder how much it really helps. Since the stock tubing, in my experience, is plenty big for the motor, and the fact that you're not making the throttle body diameter any larger (no need to, in my experience), what really is making the extra 10-12rwhp the cold air intake manufacturers are claiming? The filter. (Don't forget--Airaid doesn't REPLACE the intake tubing.) Which means I'm going to try the K&N or Amsoil filter when they're released. (K&N's on backorder until the end of August.)
What I can't argue with is the "bling factor" of the 360 Airintakez setup. It does look great, especially powdercoated to match the car's color."

I got ambitious and drilled seven 2" holes in the stock airbox to pull in more air (a la Porsche Motorsport), taking care to drill the holes in areas least apt to be affected by hot underhood air. I also ordered a K&N filter yesterday, which should arrive in 4 days. We'll see how much the setup helps, but just drilling the holes made the engine feel more responsive, producing a bit more volume out the tailpipes as well. I'll report on the addition of the K&N after it arrives.

[MagnumFreak]

i would imagine that most of the gains are FROM the filter. The cone style that the CAI manufacturers are using flow much more air than the stock units. It is not so much the visible surface area as it is the material that helps the CAI filters flow so much more air.

Just drilling the holes you indicated that the throttle seems more responsive. That indicates to me that the stock box is choked badly. So there is some benefit to a better air flow path than what the stock unit offers.

The greatest benefit that could be derived FROM the CAI units would be to leave the stock snorkle in place and have it terminate in the new box. This would provide an alternate cooler source of air for the engine. The CAI units I have seen open to the front which will help in finding a little bit cooler air but most of us have already noticed how much heat is generated by this wonderful engine. Need to add some vents to the hood.

the 360 system does offer a great deal of style with the powder coated tube. Not sure what the gains are FROM the 4 inch tube that they use. I wonder how much the stock intake tube collapses under WOT?? It is made of a pretty soft material and I am pretty sure the HEMI pulls pretty hard on that tube. Couple that with an air filter that doesn't flow as much air as it needs. Hmmmmm.

I also wonder if there is a way to add a scoop to the snorkle to ram some air up INTO the tube?? Need to look at that also.

There are so many things I want to do to this car... I just need to get away FROM work and start doing them. The joys of HAVING a job.

[billapex]

Not sure what the gains are FROM the 4 inch tube that they use. I wonder how much the stock intake tube collapses under WOT?? It is made of a pretty soft material and I am pretty sure the HEMI pulls pretty hard on that tube. Couple that with an air filter that doesn't flow as much air as it needs. Hmmmmm.

While the 4" tube is larger than the 3.5" stock tube, it still ends at the same-size throttle body, and I don't see the 3.5" tube being restrictive at all. OEM tubes are stiff enough not to collapse under WOT, especially if you REPLACE the restrictive air filter with a freer-flowing unit.