Can I simply take off the catback exhaust, muffler off my wrx?

*You can, the turbo provides the needed back pressure.

*Performance will be better than stock, same as any freeflow cat-back system.

*Depending on where you live ticket and impound fees could be about the same as a cat-back system.

*There is a reason ehaust pipes go to the BACK of the car, if you sit at idle to long you will die of CO poisoning.

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yes, you can do that. i don't know what the wrx looks like from the underside, but if you're lucky you can just unbolt it from the flange somewhere behind the cat; if not, you can take a saw to it. it will hinder the performance because it will then be an incomplete exhuast system. a good exhaust system should efficiently channel the exhaust out of the engine, and without the rest of it on the back you may get some atmospheric pressure pushing back into the pipe, which makes it harder to get the exhaust out.

it will be loud and obnoxious. if you get pulled over, have an exhaust piece or something in the back seat to show the cop that you're going to have it installed in the muffler shop. a louder car does not mean better performance, nor does a bigger exhaust system.

Wrx Muffler

You can remove the exhaust system, it's a turbo and you will notice a gain in horsepower. You do NOT need backpressure because the turbo will supply that. However it's not all sweet because the car will sound horrible unless you are only using this at a track. You will get a ticket... funny thing is that the turbo will help quiet the car down a lot. You could try to remove the exhaust after the Cat. Or just be patient and wait til you get the exhaust kit.

the answer above me is wrong. the O2 sensor is before the cat back on the WRX.

the car will run great (especially if you leave it off long enough to let the ECU adapt to the change) but it's REALLY REALLY loud. seriously. I had a VERY loud exhaust on my WRX, and this will blow your mind. you'll have it off for one drive, then likely reinstall it.

as you've probably read, if you're looking to modify the exhaust for power and sound, start at the uppipe, then downpipe. the catbacks arent' that restrictive.

zv

Loud pipes may be unlawful and yes, violates the rights of every person/house you drive by.

The noise will also be a Cop magnet...I know, I'm a retired Cop and I didn't buy the BS about getting the pipes fixed.

Also the lack of back pressure on your valves may actually reduce your performance and cause expensive top end damage to your motor.

Most of all...think of others. To defend your rights, you must protect the rights of others. Operating a motor vehicle is not a right but a licensed privilege.

Running around with just your downpipe(not "uppipe") is gonna get you pulled over fast. Specially in a subbie. I thought about doing this on my srt-4 until i heard one runnin like it, very scarey.

If anything, keep your piping on up until the muffler(should be connected by clamps), and see how it sounds....but i would just go driving around downpipe only.

What year is your Subaru? If it still under warraty leave it. Any modifications will void the warranty. Trust me I've seen it many times. If you do change the exhaust the check engine light will remain on.

YES YOU CAN DISCONNECT IT FROM YOUR DOWN PIPE AND IT WILL NOT HURT A THING! I HAVE AN 04 STI AND THEY MAKE A CUT OUT FOR RACING THAT IS RIGHT AT THE DOWN PIPE.NOTE: IT IS GOING TO BE LOUD AND YOUR CAR WILL VIBRATE! YOU WANT THE EXHAUST TO GET OUT AS QUICK AS POSSIBLE ON TURBO CARS. YOU DONT NEED ANY BACK PRESSURE