How much horsepower would a new intake and exhaust add to my 2011 subaru legacy?

jhor036
0

Asked by jhor036 Jan 27, 2013 at 12:48 AM about the 2011 Subaru Legacy 2.5i Limited

Question type: Car Customization

12 Answers

tenspeed
65,655

10-20 hp.

2 out of 2 people think this is helpful.
jhor036
0

Cool thanks are there any other ways I can improve performance w/o spending a lot of money?

DavidH25
Not Active

www.streetsideauto.com/v/2011-subaru-legacy-25i-25l/ they sell all sorts of performance parts. But I do not recommend the supercharger kit, and a 2011? Wait until your warranty, the drivetrain factory warranty runs out or it will be voided

1 out of 1 people think this is helpful.
jhor036
0

I can't afford to do anything to it yet just getting advice for what I should do in the future thanks though

DavidH25
Not Active

Right on. Good luck and the reason I suggest not buying a supercharger kit even if you could afford it, your engine life will be reduced greatly. It taxes everything up to and past the limits of what the engine can tolerate

1 out of 1 people think this is helpful.
jhor036
0

I no thanks ill probabli just put new exhaust and intake and Maby put a turbo on it

Lars Cats
3,465

Best things to do are cold air intake and a more free flowing exhaust system. Turbocharging it can be done by simply transplanting an engine from a turbo Impreza (preferably a WRX STi model), but it's not cheap. Don't try to simply put a turbo on your engine as the ECU and fuel system aren't designed for the extra air forced into the engine. You can try and set up your own fuel maps by getting a standalone fuel and ignition controller but that requires access to a dynamometer for proper tuning. All in all I'd stick to minor modifications unless you really know what you're doing and have access to the required equipment and facilities. By the way, if you do serious power upgrades you also need to do serious suspension and brake upgrades or it will handle and stop like a school bus...

2 out of 2 people think this is helpful.
Derek Dilts
135

You won't get 10-20 HP from an intake and exhaust. Not on this car. The intake already flows pretty well, and also already draws in cold air. Not only that, an aftermarket intake can throw off fueling tables on Subarus. This can adversely affect fuel mileage, among other things. Again, the factory exhaust flows more than enough for an otherwise stock car.

3 out of 3 people think this is helpful.
Jason LeBlanc
225

The intake on Subaru's are already free flowing, hell with my Turbo 2.5GT and a Cobb Tune with the Cobb Cold Air Intake I doubt its more than 3hp. Your 2.5i will likely see 1hp 2 if you're lucky from an intake. Exhaust might free up another 5hp. Aftermarket intakes can mess up the reading the Mass Air Flow sensor understands and therefor can negatively effect power and mileage on Subaru's do your homework on which intakes are safe. If I remember correctly SPT and Cobb are your safe choices with a stock ECU tune. If you really want power and easy mods the answer you don't want to hear is: trade your car in for a Turbo Subaru. You can add 35hp with a tune on an otherwise stock Legacy GT and exhaust with a matching tune will give you another 25-30hp....(all with the stock intake again showing how free they flow already). On a 2.5i the only noticeable difference with an intake and an exhaust will be sound.

2 out of 2 people think this is helpful.
Jason LeBlanc
225

Get a rear sway bar to kill the under-steer Legacys are known for and a kartboy shifter, and if you really want to treat yourself the bushing kit too....then thank me for the bestest advice haha. Good luck :-)

2 out of 2 people think this is helpful.
Trevor Hirby
275

It's actually been dyno proven that intakes don't show any real power gains.

affenrahim
0

my subaru had problem with my engine throlttle?the RPM meter when i press the brake pedal my rpm go down then released go up n normal.wat the problem?

Your Answer

Add photo

Related Questions

  • how to add horsepower/performance 6 answers

    what are some of the basic fundamentals of adding horsepower/performance to my 2.2l 1999 sub. legacy wagon?

    1999 Subaru Legacy

    -

    Car Customization

  • Do 2010 and up subaru legacy gt parts fit other legacy models of the same year? 1 answer

    I have a 2011 Subaru legacy 2.5i premium and i'm shopping for a performance exhaust system. I would like to know if legacy gt parts would fit my car.

    Subaru Legacy

    -

    Car Customization

  • Cold Air Intake 3 answers

    Does anyone make a cold air intake for the 2011 Subaru Legacy 2.5i Premium that is reliable and easy to install? Thanks, J.R.

    2011 Subaru Legacy 2.5i Premium

    -

    Car Customization

  • Will 17 or 18 inch rims work on a 2011 Subaru Legacy 2.5i? 1 answer

    Just wondering if i can buy larger rims to put on my 2011 Subaru Legacy 2.5i.

    2011 Subaru Legacy 2.5i

    -

    Car Customization

  • How long do Subaru Legacys last? 53 answers

    What is a typical lifespan for Subaru Legacy wagons? I have a 1996 Subaru Legacy Brighton with 132,000 miles (bought it used, with 18k already on it). I've kept it maintained over the years. Two di...

    1996 Subaru Legacy 4 Dr Brighton AWD Wagon

    -

    General

Legacy
Looking for a Used Legacy in your area?
CarGurus has 8,127 nationwide Legacy listings starting at $1,500.
ZIP:

Search Subaru Legacy Questions

Subaru Legacy Experts

#1 Nick Eidemiller
Nick Eidemiller
Reputation 550
#2 dandyoun
dandyoun
Reputation 340
#3 Tom Hawkins
Tom Hawkins
Reputation 270
View All

Related Models For Sale

Used Subaru Impreza"
185 Great Deals out of 9,444 listings starting at $1,495
Used Subaru Outback"
306 Great Deals out of 12,769 listings starting at $1,000
Used Subaru Forester"
237 Great Deals out of 24,291 listings starting at $1,075
Used Subaru Impreza WRX"
24 Great Deals out of 1,834 listings starting at $15,950
Used Honda Accord"
1,190 Great Deals out of 61,594 listings starting at $899
Used Subaru Impreza WRX STi"
37 Great Deals out of 987 listings starting at $9,995
Used Toyota Camry"
1,610 Great Deals out of 78,458 listings starting at $1,000
Used Nissan Altima"
1,546 Great Deals out of 84,664 listings starting at $995
Used Honda Civic"
988 Great Deals out of 60,160 listings starting at $900
Used Ford Fusion"
1,302 Great Deals out of 65,173 listings starting at $2,495
Used Mazda MAZDA6"
215 Great Deals out of 15,266 listings starting at $1,800
Used Toyota Corolla"
1,248 Great Deals out of 51,943 listings starting at $1,000
Used Volkswagen Jetta"
717 Great Deals out of 34,566 listings starting at $1,000
Used Toyota RAV4"
746 Great Deals out of 31,830 listings starting at $1,925

Used Cars For Sale

2015 Subaru Legacy 2.5i Limited For Sale
11 Great Deals out of 1,306 listings starting at $23,491
2014 Subaru Legacy 2.5i Limited For Sale
8 Great Deals out of 176 listings starting at $19,454
2013 Subaru Legacy 2.5i Limited For Sale
11 Great Deals out of 227 listings starting at $12,995
2012 Subaru Legacy 2.5i Limited For Sale
8 Great Deals out of 170 listings starting at $10,995
2011 Subaru Legacy 2.5i Limited For Sale
7 Great Deals out of 98 listings starting at $9,900