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Old 12-27-2016, 11:10 PM   #1
2slofouru
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OMGHi2U 2.5i models, aftermarket oe style replacement exhaust opinions

My 07 2.5i muffler sounds like it's restricted and whistles when I'm accelerating hard. It seems to be load related and will subside if I let off on the pedal some, only happens when taking off loaded down or when sitting and revving. I thought it could be a small leak at the muffler gasket but had the car running and in the air and couldn't feel or smell a leak there. I know these cars are slow (my other car is a 340wtq 95 impreza) but am hoping the muffler baffles may be damaged and causing the whistle and adding a little backpressure.

Has anyone else experienced this loud whistle from the muffler on their 2.5i and found the cause? I've searched but haven't found anything definite.

If it turns out to be the muffler, I'm considering getting an aftermarket direct bolt on oem replacement style version. So far I've found Bosal and Ansa stock replacements for super cheap and there is even a company that makes a no name cat back exhaust for not much more.

Is there any reason not to go with an Ansa or Bosal oem replacement? Should they be as quiet as the oem? Besides the fake turbo whistle , the exhaust is super quiet, which is awesome to take a break from the beast mode exhaust on my 95. Thanks for reading

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Old 12-28-2016, 12:08 AM   #2
drpoop
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If it's at all similar to the FB20, unrestricting the exhaust without spending thousands on headers and an intake and all that crap kills torque.
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Old 12-28-2016, 01:04 AM   #3
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Id try the oem exhaust..just right amount of noise. Torque will be moved 500+ in the rev range.but it makes driving more fun.
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Old 12-28-2016, 01:04 AM   #4
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Quote:
Originally Posted by ssssssantimonio View Post
Id try the oem exhaust..just right amount of noise. Torque will be moved 500+ in the rev range.but it makes driving more fun.
I mean obx
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Old 12-28-2016, 07:15 AM   #5
2slofouru
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nothing to do with what I'm trying to accomplish, but thanks for the bump and free laughs

I'm trying to 1- Replace the oem muffler with a new aftermarket if it turns out the oem has damaged baffles and could be causing the whistling and possible restriction. 2- Replace the oem with something as quiet...to keep the car quiet I don't want a "sporty" or louder muffler.


Quote:
Originally Posted by drpoop View Post
If it's at all similar to the FB20, unrestricting the exhaust without spending thousands on headers and an intake and all that crap kills torque.
Quote:
Originally Posted by ssssssantimonio View Post
Id try the oem exhaust..just right amount of noise. Torque will be moved 500+ in the rev range.but it makes driving more fun.
Quote:
Originally Posted by ssssssantimonio View Post
I mean obx
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Old 12-28-2016, 10:51 PM   #6
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The only brands I've found readily available are Ansa, Bosal, and Walker. I don't have much faith on Walker products, always seem shoddy. The only issue I have with installing one of these bolt on mufflers is whether or not they will still be quiet. The oem muffler is pretty large, which helps take a ton of noise out. The Ansa and Bosal look smaller. They are also normal "aluminized" steel vs the 409 stainless oem stuff that resists rust much better.
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Old 01-06-2017, 09:08 PM   #7
ALTR EVO
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I installed a bosal muffler and mid pipe (and recently down pipe) on my wife's old 2.5i. The muffler is longer than OEM and ended up hitting the rear sway bar (also OEM). It caused an annoying rattle constantly. Otherwise, it seemed to be just as quiet.

Chris
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Old 01-06-2017, 09:23 PM   #8
2slofouru
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Thanks for the input! I may end up replacing the mid pipe after checking condition when replacing the muffler. The flanges and bolts are pretty rusty so I already have new oem gaskets, bolts and springs.
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Old 01-08-2017, 10:01 AM   #9
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No problem! It's probably not a bad idea to do the middie. With all the road salt that is used up here in the winter, her exhaust was trashed. Within a year of replacing the midpipe and muffler, the flange from the downpipe (where it meets the midpipe) had torn itself apart. I was wishing I had just done it all at once. I think if you go with slightly longer exhaust hangers, you can use the bosal muffler without interference with the rear stabilizer bar.
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Old 01-16-2017, 11:35 PM   #10
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With your mention of the bosal touching the bar, I tried the ansa and it fits great. It does have a baby growl from low rpm taking off, but not annoying. It's also noticeable up until around 2500rpm but then quiets out. On the freeway you can't hear it. It's also way lighter than oem which probably means the stuffing won't last long. I do miss how whisper silent the factory one was at cruise, but man it whistled like crazy when accelerating. I was tempted to cut it open but threw it on our scrap pile instead.

I found an AP muffler for just under 200 and it has the sti style tip but there's no point when this ansa seems to work fine. The ansa does have a baby size tip, though, like half the diameter of the oem.

I plan on doing the midpipe soon, the bosal looks to be the best quality of the aftermarkets, welds look very nice and smooth transitions.
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Old 02-12-2017, 07:26 PM   #11
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I installed the bosal midpipe/resonator and it got a little louder, the center pipe also hangs a little lower (which I don't like). It does line up ok, I did have to bend the hangers on the rear of the muffler to keep them from tapping the left muffler hanger bracket. The pipe was also hitting the diff after the midpipe install but after bending the muffler hangers it's fine. I am starting to find the little baby growl annoying though, was wanting it whisper quiet like oem. I don't want people to think I'm trying to race them from stops.
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Old 02-22-2017, 05:02 PM   #12
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Well my system developed a hole in the muffler and the pipe just upstream of the muffler (rust). Looks like I'll be replacing the Bosal with something else. That didn't last long.
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Old 02-22-2017, 08:09 PM   #13
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Wow...that sucks. Walker has a stainless version, but I can't find a clear picture of the rear to see outlet size and length. Not sure the brand is worth anything, but it does claim stainless. I really wish the oem muffler wasn't so ridiculously priced, they are way larger and super quiet. I'd rather have stock center pipe and muffler. :/
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Old 02-25-2017, 04:48 AM   #14
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I can confirm the whistle on the exhaust and was told a while ago that it is a common issue ( being a loose or shifted baffle inside ). As far as restriction goes, my 06 2.5i doesn't feel restricted at all. I actually like the power it provides...... well provided. Dreaded overheating issue due to the HG leaking which I plan on fixing real soon.

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Old 03-01-2017, 10:39 PM   #15
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Howdy this is my first answer\comment on a forum, I replaced my whole exhaust system on my 07 impreza 2.5i n\a with tsudo uel headers w\ cat pipe for a 05 rs along with a tsudo cat back, my stock had a slight whistle to it as well. But I like the loud, WRX sound. And it did add a little but of HP, so if that's a route you are willing to take, there is a great forum write up about it on here its not hard to find. Good luck my friend!!
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Old 03-02-2017, 11:13 AM   #16
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I love my Cobb Turboback. Sorry I don't have much more of an answer.
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Old 03-02-2017, 08:40 PM   #17
2slofouru
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I do love the throaty growly uel sound, had it on my previous 2.5na swapped impreza and the ej20k swapped one. This car is for trips though and it's awesome being able to go from my beast mode 3" full turbo back 95 to this silent luxury 07. I just want to optimize flow and keep it quiet. This borla center pipe and ansa muffler aren't a great combo for sound and I wonder if the tiny tip on the ansa is holding back a little. It's a good bit smaller than the oem, even though it matched for application. Just sucks I couldn't see the aftermarket mufflers in person before buying. There is one that's aftermarket and has the good size inlet pipe and sti sized outlet even with a stainless larger sti type tip. That would be awesome for this car...without the giant tip. I don't want people trying to race. It's just about twice the cost of the one I bought and no guarantee it will be quieter.

It's obvious even in this pic the canister as well as the inlet and outlet are larger.
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Old 03-11-2017, 10:03 AM   #18
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I know you said you don't want nothing loud but invidia makes good catbacks and they are stainless just something to look into.
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Old 03-11-2017, 07:03 PM   #19
2slofouru
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Invidia doesn't make anything quiet for Subarus. The Q300 isn't too loud on an unequal header car, but on my equal header it will drone too much and be noisy at most rpms. I have a Q300 on my swapped equal length impreza and plan on getting something quieter. The Q300 is just too small to muffle enough sount, all they had to do is make it fill the space of the oem muffler.

The Ansa on my 2.5i seems to be getting louder each day and adding the borla midpipe didn't help. I'm going to try something else.
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