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Old 04-26-2004, 12:26 PM   #1
Blair
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Have a Nice Day? APS 3" Turboback Exhaust w/ twin tips

Installed an APSWRX HOE8 3" turboback with cat and twin tip muffler on my '04 WRX and have mixed feelings about it. The welds and construction are beautiful. The cast turbo outlet was of remarkable quality and fit perfectly. Everything bolted up nicely and the tips sat square in the rear bumper cutout. The performance gain is definitely there... faster spool down low and it pulls like crazy up top. At cold idle it is a bit loud, but once the car warms up to hot idle it quiets down to a near stock sound level. Driving around at part throttle is not too bad. However, from about 3000 rpm to 4000 rpm at larger throttle openings it gets very loud and resonates like crazy. WOT is pretty loud too, but that is to be expected. The real problem is highway cruising from 65-80 mph. The car is uncomfortably loud and even short trips will result in headaches. The thing is loud and resonates and drones in the car. Also the exhaust tends to make the car vibrate more, so any squeeks and rattles will be made worse. I tried dynamatting the trunk area around the muffler and the holes in the rear parcel shelf, but it didn't help.
I do alot of highway driving so I could not stand it. I ended up taking off the cat back portion and attaching the stock center pipe and muffler to the APS downpipe section. Much quieter, but if feels like I lost a little top end. I am much happier now.

Blair
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Old 04-27-2004, 05:40 AM   #2
jlevy
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Was the exhaust touching the car anywhere it shouldn't be? I don't have any experience with the system you're talking about, I've got an axle-back that touched the frame where the left rear lateral link mounts.

-JL
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Old 04-28-2004, 11:01 PM   #3
Blair
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No, I checked the muffler and center pipe for signs of contact... and nothing. I remember visually checking the clearance after install and there was plenty of room all around. There is just something about the 3500 rpm range that makes that thing vibrate and resonate like crazy. BTW the APS tbe has no flex section of any kind on it. Perhaps it is necessary to have some sort of flex in it somewhere to control such vibration. Couldn't be more pleased with the downpipe though

Blair
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Old 04-30-2004, 01:27 AM   #4
NewShockerGuy
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eekk about the droning and headaches...! Not to thread crap but I got the txs rfl tbe... I was worried about droning and now that I just read your review on your tbe I am begining to get worried... I drive an hour each way to work all highway.

Do you think you can post some pics if possible? How did the center section bolt up to the exhaust? I thought most ones are specific to the manufacture... IE APS only works with all their exhaust components... mid, dp, axle back...

Thanks :-)

-Nigel
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Old 04-30-2004, 10:32 PM   #5
FCSTI
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Did you have any problems with the O2 sensor... I heard that the exhaust isn't equiped with a location for the sensor
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Old 05-03-2004, 09:59 AM   #6
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I have the aps 3/2.5" tbe with single tip muffler, and I am running catless. My experience is quite different than Blair's.

While the exhaust does get uncharacteristically louder from about 2500-3200 rpm, it smoothens out nicely after that.

There is no drowning at highway speeds in my car. With the windows down at these speeds, it is not very not loud at all, but becomes more noticable with them up. Still it is not at all bothersome, and I am partial to quiet exhausts.

As Blair said, quality and fitment are awesome.
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Old 05-04-2004, 01:43 PM   #7
Blair
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Well I put the APS catback back on because I was getting a little leak with the stock centerpipe. I am trying to adjust to the sound level. At times I don't mind because it sounds cool. But when I've got passengers in the car or my daughter it can get annoying/embarassing.
I dynamatted my rear doors and part of the trunk and that seems to have helped a little. I think I will dynamat a little more or try something else to block the sound.
If worse comes to worse maybe I can buy the 2.5"/3.0 single tip catback exhaust as that is advertised by APS to be 3 db quieter.

Blair
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Old 05-04-2004, 01:46 PM   #8
Blair
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My TBE did come with an O2 sensor, but it is in a completely different location from stock. It is on the side of the downpipe, below the cat section, a few inches from where it elbows up to the cat and turbo. You have to completely rearrange the wiring for the sensor as it is now about 18" away from the stock location towards the front of the car. BTW, you will get a CEL with this TBE even with the cat.

Blair
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Old 05-07-2004, 04:12 PM   #9
kinkinhood
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hey Blair, how difficult is it to do the rewiring for that?
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Old 05-10-2004, 12:21 PM   #10
Blair
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The O2 sensor is attached to the frame and transmission with some plastic fasterners that pull right out. Just pull two of the fasteners out and reroute the wiring up to the front. Then use some zip ties to secure the wire and keep it from hanging down. Need to route it creatively to keep some slack in the wire and prevent it from hanging too low.

Blair
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Old 05-10-2004, 11:11 PM   #11
kinkinhood
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Danke Blair.
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Old 06-04-2004, 03:59 PM   #12
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I had a problem with the APS 3" exhaust resonating at highway cruise (3200-3400 rpm) as well. Mine was a single tip however. I swapped a prodrive muffler for the APS which helped a good bit but not 100%. On long trips the noise was troublesome. I eventually developed an exhaust leak on the center section which I could not cure so I took the entire system off. The power loss is dramtic enough to make me try again. I think this time I will replace the leaky flange joint with a ball joint and see if that helps with the resonating problem.
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