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Old 03-06-2013, 10:47 AM   #1
WRXinpa
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Join Date: Jan 2012
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2012 WRX Hatch SWP
TP Stage 2

Default SPT Exhaust - Resonator Install

Recently installed a lightly used 5-door SPT exhaust on my 2012 WRX hatch. Love the rumble, but the cabin resonance around 1,500 rpms is pretty brutal, especially during cold starts (that's where it idles). Also, highway drone isn't terrible but it would be nice to reduce it some.

Since I want to have my cake and eat it too...I am going to install a resonator. I also want to bring the tips back and inch or so because the exhaust currently discharges under the bumper cutouts, which undoubtedly contributes to cabin noise. What do you think of this overall project and the below resonator?

http://www.jegs.com/i/Dynomax/289/24...rentProductId=
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Old 03-06-2013, 10:58 AM   #2
Mr Wrex
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Are you going to be fab'ing the resonator on yourself or having a shop do it? If it's the latter, I would ask them what they prefer to use. Unfortunately for you, the SPT midpipe cannot be swapped, which would have made it so much easier for you to pull off. You might want to even consider getting another catback and hopefully someone else could chime in about which hatch catbacks have little drone.
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Old 03-06-2013, 11:02 AM   #3
WRXinpa
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Quote:
Originally Posted by Mr Wrex View Post
Are you going to be fab'ing the resonator on yourself or having a shop do it? If it's the latter, I would ask them what they prefer to use. Unfortunately for you, the SPT midpipe cannot be swapped, which would have made it so much easier for you to pull off. You might want to even consider getting another catback and hopefully someone else could chime in about which hatch catbacks have little drone.
Thanks for the reply. I've seen hundreds of "no way bro, that exhaust doesn't drone at all" threads, so I don't want to go there. I'd like to keep the SPT, just want to keep most of its noise outside of the cabin.

I would have a mechanic cut the SPT midpipe and weld the resonator in place. Might have to modify the hangers a bit to bring the exhaust further out the rear.

Last edited by WRXinpa; 03-06-2013 at 12:03 PM.
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Old 03-06-2013, 11:47 AM   #4
Mr Wrex
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I would definitely do that and ask him what he thinks, assuming he has an opinion on the matter. You can also throw some sound deadening in there to quiet the drone. See this thread for more info:
http://forums.nasioc.com/forums/show...php?p=36070599
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Old 03-07-2013, 08:30 PM   #5
WRXinpa
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So I looked under the car today and realized that the sway bar (stock) is touching the axle back pipe, before the muffler. I am lowered on epic springs, but not slammed by any means. Is there any way to raise the sway bar? I don't want to drop the already low hanging exhaust...

Maybe an aftermarket sway bar will have more clearance??
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Old 03-07-2013, 11:45 PM   #6
art@grimmspeed
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Quote:
Originally Posted by WRXinpa View Post
So I looked under the car today and realized that the sway bar (stock) is touching the axle back pipe, before the muffler. I am lowered on epic springs, but not slammed by any means. Is there any way to raise the sway bar? I don't want to drop the already low hanging exhaust...

Maybe an aftermarket sway bar will have more clearance??
An aftermarket bar is going to be thicker. Unless you can find one that is bent different. I would try some Kartboy hangers
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Old 03-11-2013, 07:32 PM   #7
Anubis80
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Quote:
Originally Posted by chris@grimmspeed View Post

An aftermarket bar is going to be thicker. Unless you can find one that is bent different. I would try some Kartboy hangers
That should solve your clearance right there
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Old 03-12-2013, 04:06 PM   #8
WRXinpa
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I lowered the exhaust height and it made a significant difference in the reverberation because the axle back is no longer touching the sway bar.
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Old 03-12-2013, 04:17 PM   #9
leftyonly
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So are you going to revise your post here to reflect your findings:

http://forums.nasioc.com/forums/show...7#post39294807

Quote:
I just posted about the SPT droning. Some people say its quiet, some say its pretty damn loud. I definitely would NOT say its quiet.

Maybe its the difference between one car to the next and/or our ears...either way I'd suggest riding in someone's car that has one if you have the opportunity. Its a quality piece (aside from the stamped flanges) and seems to be the most bassey of all aftermarket exhausts.

BTW..I'm in my 30's and not looking to simply make noise, just want to enhance the experience
Seems that an update may be in order so as to not mislead...and maybe others that say it is loud/droning have a similar issue and benefit from your experience...
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Old 03-13-2013, 07:39 PM   #10
BrigadoonB
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12 wrx sedan here...
I thought about installing one myself but after taking the carpet out of the back, laying down some sound damping material and covering half of the vent holes in the right and left rear of the trunk...that helped a lot. After that....no droning at the low rpm levels.
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Old 03-13-2013, 07:51 PM   #11
WRXinpa
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Quote:
Originally Posted by BrigadoonB View Post
12 wrx sedan here...
I thought about installing one myself but after taking the carpet out of the back, laying down some sound damping material and covering half of the vent holes in the right and left rear of the trunk...that helped a lot. After that....no droning at the low rpm levels.
Thanks, I actually took out the spare tire last weekend to investigate. I laid a beach towel under the spare and stuff one in each corner of the hatch, by the vents - making sure not to cover the vents themselves. Had the cut the bottom portion of the foam inserts off to accommodate the towels. Pretty ghetto, but it was worth a shot. Seemed to help a bit with the overall noise.

The thin plastic "door" of the vents does buzz a lot, but I doubt its even audible in the cabin.

What sound dampener did you use?
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