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Old 12-08-2005, 11:24 PM   #1
dpk777
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Default STi vs. ProDrive Oval Axleback

What's the difference in perforance and volume?

The prodrive is a little too loud for me (i know it one of the quietest though).

I'm thinking about trading for an STi axleback.
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Old 12-08-2005, 11:33 PM   #2
Phil Jr.
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ive had both, the prodrive was on my stg2 WRX.

If you think the prodrive is still a little too loud the STI axleback should be perfect. Dont think the STi axleback whispers either. I set off car alarms daily in my apartment complex...its not loud, just has a deep rumble. Performance differences? None. Another person on this forum dynoed their car 1st with the stock STi axleback, then removed it completely and did another pull. IIRC there were no power gains.
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Old 12-08-2005, 11:33 PM   #3
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Prodrive too loud? wow never heard that before. Whats the Dia of the Sti axleback?

Go test drive/ start up an STi at the dealer and see how you like it. May sound a little different though when you put it on a 2.0L.
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Old 12-08-2005, 11:37 PM   #4
Phil Jr.
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IIRC the STI axleback is 2.5" as opposed to 2.25" on regular WRXs.
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Old 12-08-2005, 11:43 PM   #5
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Prodrive loud??? It on the low end of the exhaust scale.Quiet most of the time.Nice deep sound when you get on it,but noting to loud.
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Old 12-08-2005, 11:54 PM   #6
Phil Jr.
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meh, im with dpk...I think the prodrive is just a little too loud.
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Old 12-09-2005, 12:28 AM   #7
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Loud? Prodrive is like the quietest exhaust I've tested. The STi muffler is a little quieter though. More info: http://forums.nasioc.com/forums/showthread.php?t=677926
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Old 12-09-2005, 03:22 AM   #8
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Quote:
Originally Posted by Unabomber
Loud? Prodrive is like the quietest exhaust I've tested. The STi muffler is a little quieter though. More info: http://forums.nasioc.com/forums/showthread.php?t=677926
Yeah, it is quiet....for an aftermarket muffler, but once you start removing the cats or just running one high flow cat, not so much. Going to an OEM muffler would be less obtrusive if you're looking for a quiet stage 2 setup.
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Old 12-09-2005, 03:32 AM   #9
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let me assure you my STi with an HKS downpipe and stock catback is NOT quiet
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Old 12-09-2005, 04:20 AM   #10
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Wow. This is exactly the question I've been researching.

All of the exhausts I recall being mentioned on NASIOC as 'quiet':

STi
Prodrive
Borla Hush
Stromung

Currently, my gutted OEM UP, Cobb catted DP, and stock catback is very quiet...almost stock. If you didn't own the car, you'd never guess it had a higher flow system.

Of the four above, the STi will add the least volume to my setup, right? I also understand that the STi is also just a little bit raspier than the deep, mellow-sounding Prodrive, correct?

More opinions please!
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Old 12-09-2005, 10:50 AM   #11
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I have the STi axleback with catless DP and it's near stock quiet from what i can tell. I orignally had the stromung dual tip, and that got kind of loud so i went back to the stock wrx muffler. My tuner thought that was holding me back somewhat so i picked up a used STi and it's not any louder that i can tell.
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Old 12-09-2005, 11:32 AM   #12
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listen closer, its louder.
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Old 12-09-2005, 12:08 PM   #13
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I posted a reply similar to this one over on saab92x.com. I'm running w/ a gutted stock UP, Crucial DP, stock 3rd cat, stock resonator pipe, 04 STi axleback which is 2.25" (although I do have a 2.5" 05 STi axleback in the basement), Cobb Stage2/93 oct.

I was running w/ the stock catback for a few weeks before getting the STi axleback. As 02WHITEDUB said, w/ the stock catback the car sounds pretty close to stock when heard from the rear.

W/ the STi axleback, at idle and lower rpms there is a very noticeable grumble that's audible both inside and outside the car, which wasn't there at all w/ the stock catback. When revving in neutral or getting on it on the road, the STi axleback is noticeably louder than stock. It's not loud, but it's definitely not near-stock quiet.

dpk777: Like I said on saab92x.com, I live within a half hour's drive of you I think, let me know if you ever want to meet up to compare Prodrive oval with STi axleback.
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Old 12-09-2005, 12:17 PM   #14
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just get a blitz catbacl, the quietest out there
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Old 12-09-2005, 01:47 PM   #15
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Too loud??? Are you cra.......oh wait....nevemind.... OP is a Saab driver .

Seriously though, even the prodrive can be pretty loud inside of a wagon, as the rear of the wagon acts like a giant amplifier...funny, I just assumed all that fancy sound deadening material thrown in the Saabaru would have taken care of that
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Old 12-09-2005, 01:50 PM   #16
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Quote:
oh wait....nevemind.... OP is a Saab driver
you speak as if its a real saab or something....
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Old 12-09-2005, 04:23 PM   #17
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Quote:
Originally Posted by 02WHITEDUB
Wow. This is exactly the question I've been researching.

All of the exhausts I recall being mentioned on NASIOC as 'quiet':

STi
Prodrive
Borla Hush
Stromung

Currently, my gutted OEM UP, Cobb catted DP, and stock catback is very quiet...almost stock. If you didn't own the car, you'd never guess it had a higher flow system.

Of the four above, the STi will add the least volume to my setup, right? I also understand that the STi is also just a little bit raspier than the deep, mellow-sounding Prodrive, correct?

More opinions please!

Definately, I went from Stg 1 with a Prodrive muffler which was very deep and mellow, to a catless up, highflow cat Cobb DP and while the Prodrive is still nice and deep, it's not so mellow anymore.
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Old 12-09-2005, 06:40 PM   #18
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If you are running completely catless with no resonators, even the ProDrive or Greddy Evo will be loud and drone on the highway. I am running completely catless and recently swapped my ProDrive muffler for an STi muffler and it is perfect. Nice, low rumble at idle but quiet in the upper revs and on the highway. There is only an 1/8" difference in pipe diameter, so any loss in HP would be negligible and well worth it IMHO.

Jimbo
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Old 12-09-2005, 06:48 PM   #19
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Quote:
Originally Posted by IIdiceII
just get a blitz catbacl, the quietest out there
ill trade mine for prodrive, its too quiet
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Old 04-26-2006, 10:54 AM   #20
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Is the difference in power/spoolup between prodrive and the sti muffler really negligible? I am trying to decide between the two - right now I have a turboxs stealthback (hi-flo cat) with the stock wrx axleback. I want it to be quiet but I want the gains of an axleback . I heard axlebacks can make a difference of between 5 and 10 hp but perhaps the more significant gain is in spoolup. The performance aspect is important to be but I also don't want a noticeably loud exhaust.

Anybody got any more experience on the difference between these two?

Thanks!
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Old 04-26-2006, 04:19 PM   #21
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I personally love the prodrive.. I did not want something too loud either.. thought that maybe the prodrive was a lil loud at 1st .. but after a while its perfect. I do not drone either. Going 50mph its hard to tell it from stock. Get on it and its just wonderful!
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Old 04-26-2006, 05:19 PM   #22
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Quote:
Originally Posted by Jfrankon
Too loud??? Are you cra.......oh wait....nevemind.... OP is a Saab driver
I would hope that's a joke. Otherwise, you don't know what the **** you're taking about. Don't be mad because he paid less for his car then a WRX stickers for. Not to mention warranty....

IIRC it's about 50 pounds of sound deadning. I was running a Borla 2.5' single-tip mated to an Invidia DP and it sounded like a Harley. So I put the STI catback on and I can finally drive my car without having to worry about how damn loud it is.
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Old 04-26-2006, 06:09 PM   #23
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Quote:
Originally Posted by Leadfoot77
Is the difference in power/spoolup between prodrive and the sti muffler really negligible? I am trying to decide between the two - right now I have a turboxs stealthback (hi-flo cat) with the stock wrx axleback. I want it to be quiet but I want the gains of an axleback . I heard axlebacks can make a difference of between 5 and 10 hp but perhaps the more significant gain is in spoolup. The performance aspect is important to be but I also don't want a noticeably loud exhaust.

Anybody got any more experience on the difference between these two?

Thanks!
a member here dynoed an STI with its stock axleback on and then completely off. There was no difference. Once you go for a lot of power though, I think the stock axleback may become a restriction...but not at stock or close to stock power.
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Old 04-26-2006, 07:16 PM   #24
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Quote:
Originally Posted by Phil Jr.
a member here dynoed an STI with its stock axleback on and then completely off. There was no difference. Once you go for a lot of power though, I think the stock axleback may become a restriction...but not at stock or close to stock power.
Yea I saw that posted earlier in this thread... I'd love to see the graphs for that - it's kind of hard to believe that removing that restriction has absolutely NO effect.
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Old 04-26-2006, 07:28 PM   #25
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prodrive is a little bit loud, ive had about 9 exhaust setups haha including the infamous RFL-Ti so I know what is loud and whats not. I have a full catless exhaust with no resonators and the prodrive definitely becomes a monster when you stomp on it, its a lot louder than I was expecting when I purchased it. But i love it.
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