Saturday, February 11, 2012 Login | Sign Up

You are here :

Current Articles | Archives | Search

02

K&N High-Flow Intake System Adds 17.52 Horsepower to the 2008-10 Subaru STI 2.5L

Mike Kojima posted on March 02, 2010 14:13

K&N High-Flow Intake for 2008-2010 Subaru STI
K&N High-Flow Intake System Adds 17.52 Horsepower to the 2008-10 Subaru STI 2.5L

MotoIQ Staff Report

K&N has recently released their High-Flow Intake System for the 2008-10 Subaru WRX STI, (part no. 69-8005TTK) increases horsepower by 17.52 hp at 5260 rpm over the stock intake configuration. To achieve such a performance increase, K&N replaces the original intake assembly; including the air box, air filter and intake tube with an all-new intake design. The new system draws air through a K&N High-Flow Air Filter that increases airflow and never needs to be replaced. Protecting the cone-shaped air filter, and isolating it from engine heat, is a powder coated heat shield that replaces the stock air box. As it passes the filter, air travels through a K&N mandrel bent aluminum tube that is formed and shaped, in the design phase, to drive a more laminar flow of air to the car’s engine.

k&n high flow intake for 2008-2010 Subaru STI dyno chart

The 69-8005TTK is currently available where quality performance is sold, can be installed in 90 minutes or less and is backed by the same K&N Million Mile Limited Warranty® as all K&N OE Replacement Air Filters.

K&N Engineering, Inc., with headquarters in Riverside, California, has been the world's leader in performance filter technology since 1969, serving the needs of the automotive, motorcycle, marine, industrial and military markets. K&N is heavily involved in nearly every form of motorsports, from off-road and powersports, to drag racing, stock cars and road racing. For more information about K&N, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 858-3333, (951) 826-4001 Fax, or to see updated vehicle applications visit www.knfilters.com®. MSRP - $499.00

Posted in: Magazine, Tech, Industry News & Rumors, Subaru, WRX

Actions: E-mail | Permalink | Comments (12)

Comments

# brandon drecksage

Tuesday, March 02, 2010 4:15 PM

ummm...$500?....I hope that isn't what places sell it for. Thats insane.

# Kaane

Tuesday, March 02, 2010 4:22 PM

I would love to know how much of that gain was due to leaner AF ratio.

# Street Surgeon

Tuesday, March 02, 2010 4:44 PM

Subi's have always been a little sketchy with intakes, but I guess you can't argue with 17ish whp. That being said, 500.00 for a piece of mandrel bent steel and a cone filter... Hah.

# Mike Kojima

Tuesday, March 02, 2010 4:58 PM

Well it looks like you are getting a machined MAF element, veloctiy stack and an airbox/heat shield. Our Project STI responded well to an air intake system as well.

# Street Surgeon

Tuesday, March 02, 2010 5:42 PM

Heh, also comes with some nylon lock-nuts too!!! After some poking around it looks like this can be had for around 325.00 shipped from more than a few vendors which is much more reasonable / worth it.

# brandon drecksage

Tuesday, March 02, 2010 8:23 PM

agreed about the 325 comment. Much more resonable.

# induetime

Tuesday, March 02, 2010 9:24 PM

2nd about "I would love to know how much of that gain was due to leaner AF ratio. "
I see many 350z & some other cars making the power from a different a/f ratio more than the intake its self.

# Street Surgeon

Wednesday, March 03, 2010 3:45 AM

Wouldn't a MAF based car simply calculate the increased airflow and add fuel though?

# brainrush

Wednesday, March 03, 2010 7:15 AM

Not necessarily. If the MAF sensor housing is larger than stock, because then it is calculating the volume of air flow for a smaller diameter tube than is actually installed on the car, so the difference in air volumes would be proportional to the difference between the area across the new intake tubing minus the area across the original intake tubing. I think what you're saying might work on a MAP sensor based car.

# mikemiessler

Wednesday, March 03, 2010 7:54 AM

can someone explain the graph for me please? Last time I checked the STI made close to 300hp not 193hop

# Street Surgeon

Wednesday, March 03, 2010 8:19 AM

@Brainrush

Ah, I guess I was thinking of cars where the MAF element was in it's own enclosure (Like a Z32 or Evo 8/9) and all the air was pulled through and calculated before the intake pipe.

@Mike

Well the STi makes ~300hp at the crank according to the manufacturers claims, but I'm sure after the drivetrain loss there's going to be quite a bit less at the actual wheels. For example back in the day import tuner had a project 1G DSM which after a tune-up baselined at just around 150whp stock. The manufacturer claimed they made ~195hp which sounds about right if you figure in a 20% drivetrain loss.

Anyways that does seem pretty weak for even a stock STi; maybe the ambient temps when they were testing were high or something.

# Naji Dahi

Friday, March 05, 2010 1:48 AM

The gain in power from the intake comes in part from the ability to hold more boost at the high end of the rpm curve. I have seen it with Evos and Subies with intakes. On my own Evo right after I installed an AEM intake I hit boost cut even w/o changing anything else in the tune.

You will also need to get a tune after you install an intkae on Subies and Evos. On the Evo X almost all intakes make the LTFT cruise go really positive and in some cases triggering a p0171 system too lean code. The trims feed into WOT operation and make the car run WAY rich.

On the Subie the intake can make the trims negative and that makes the AFR at WOT lean and can cause knock.

It is very unwise to install an intake on the Evo X or any turbo subie w/o getting tuned for it.

Post Comment

Only registered users may post comments.

MotoIQ Proudly Presents Our Partners: