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

20

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

Question type: Car Customization

14 Answers

92,475

10-20 hp.

3 out of 3 people think this is helpful.
20

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

2 out of 2 people think this is helpful.

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.
20

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

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.
20

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

4,815

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...

5 out of 5 people think this is helpful.
165

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.

5 out of 5 people think this is helpful.
345

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.

6 out of 6 people think this is helpful.
345

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.
345

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

1 out of 1 people think this is helpful.

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?

15,735

Why do you think you need more horsepower and what will that do for you? You're not going to Indy? Bad call, the person who mentioned your warranty is correct.

10

Honestly the best power up grade I have ever done is the GrimmSpeed SCREAMING PHOENIX TRIPLE SEQUENTIAL UP- PIPE. I'm running this with stock tune and its incredible!!!! My buddies and I are guessing i make about 500whp now in my 09 LEG GT. Do a google search you won't be sorry...

1 out of 1 people think this is helpful.

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

  • Adding power to a subaru legacy 1 answer

    I recently bought my first car a 2011 subaru legacy r and was wondering how to get more power out of the car. I'm looking for performance upgrades that don't break the bank to much.

    2011 Subaru Legacy 3.6R Limited

    -

    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

  • How do i add horsepower to my 2.0 legacy?pls help. 1 answer

    2010 Subaru Legacy

    -

    Car Customization

  • How long do Subaru Legacys last? 58 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 15,116 nationwide Legacy listings starting at $950.

ZIP:

Search Subaru Legacy Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Subaru Legacy Experts

#1 Anthony_60
Anthony_60
Reputation 1,130
#2 Nick Eidemiller
Nick Eidemiller
Reputation 680
#3 dandyoun
dandyoun
Reputation 600
View All

Related Models For Sale

Used Subaru Impreza
170 Great Deals out of 11,067 listings starting at $1,899
Used Subaru Outback
314 Great Deals out of 26,224 listings starting at $1,000
Used Subaru Forester
299 Great Deals out of 22,330 listings starting at $1,290
Used Subaru Impreza WRX
59 Great Deals out of 1,130 listings starting at $1,500
Used Honda Accord
999 Great Deals out of 74,757 listings starting at $899
Used Toyota Camry
1,127 Great Deals out of 96,509 listings starting at $1,250
Used Honda Civic
796 Great Deals out of 70,152 listings starting at $1,200
Used Subaru Impreza WRX STi
26 Great Deals out of 575 listings starting at $12,000
Used BMW 3 Series
1,459 Great Deals out of 38,439 listings starting at $1,890
Used Audi A4
310 Great Deals out of 11,991 listings starting at $800
Used Mazda MAZDA6
183 Great Deals out of 15,610 listings starting at $2,400
Used Acura TL
285 Great Deals out of 7,535 listings starting at $2,450
Used Honda CR-V
867 Great Deals out of 61,536 listings starting at $1,495

Used Cars For Sale

2017 Subaru Legacy 2.5i Limited For Sale
2,953 listings starting at $26,692
2016 Subaru Legacy 2.5i Limited For Sale
4 Great Deals out of 276 listings starting at $19,991
2015 Subaru Legacy 2.5i Limited For Sale
5 Great Deals out of 158 listings starting at $16,763
2014 Subaru Legacy 2.5i Limited For Sale
9 Great Deals out of 180 listings starting at $9,995
2013 Subaru Legacy 2.5i Limited For Sale
4 Great Deals out of 173 listings starting at $11,388