How to? 300HP + QUIET exhaust sound
12-16-2003, 09:35 PM
#1
Registered User
Thread Starter
Join Date: Sep 2003
Location: Chicago, IL
Posts: 17
Car Info: 1999 Supercharged Maxima
How to? 300HP + QUIET exhaust sound
Calling all WRX experts...
300+ crank HP with exhaust NO louder than stock on a 2004 WRX...
Possible? If yes, HOW?
Absolutely, positively, quiet ride at all times...during idle, WOT, cruising, etc.
Thanks in advance.
300+ crank HP with exhaust NO louder than stock on a 2004 WRX...
Possible? If yes, HOW?
Absolutely, positively, quiet ride at all times...during idle, WOT, cruising, etc.
Thanks in advance.
12-16-2003, 10:15 PM
#3
VIP Member
iTrader: (2)
Join Date: Nov 2002
Location: Under your bed, in your closet, and in your head
Posts: 15,425
Car Info: Corvette Z51
No matter how much tuning you do, try to top it off with an exhaust known to be quiet such as the Greddy Evo or Blitz Nur-Spec Touring (NOT the Nur-Spec R or Nur-Spec V, they're two of the loudest). Either that, or stuff cotton in your muffler 
12-16-2003, 10:58 PM
#7
VIP Member
iTrader: (2)
Join Date: Nov 2002
Location: Under your bed, in your closet, and in your head
Posts: 15,425
Car Info: Corvette Z51
Originally posted by iLoqin
Borla Hush bro.
Borla Hush bro.
And escaflowne, the Nur-Spec Touring makes comparable gains with the standard Nur-Spec, if I remember correctly. It's just that it's a bit heavier.
12-17-2003, 07:23 AM
#8
Registered User
Thread Starter
Join Date: Sep 2003
Location: Chicago, IL
Posts: 17
Car Info: 1999 Supercharged Maxima
Blitz, Borla, Greddy
I currently drive a supercharged Nissan Maxima and it is catless (straight pipe) with Greddy EVO exhaust.
Maybe the Greddy is different on a WRX, however, on a Maxima, it is pretty loud. Even at crusing, you can hear the constant humming. After 2 years of that, I am truly sick of the noise.
What about TurboXS exhaust products? If I can get a quiet, stock-like ride, I'd just slap on their Stage III and done!
Appreciate your feedback.
Maybe the Greddy is different on a WRX, however, on a Maxima, it is pretty loud. Even at crusing, you can hear the constant humming. After 2 years of that, I am truly sick of the noise.
What about TurboXS exhaust products? If I can get a quiet, stock-like ride, I'd just slap on their Stage III and done!
Appreciate your feedback.
12-17-2003, 08:09 AM
#9
Registered User
iTrader: (7)
Join Date: Dec 2002
Location: Sacramento CA
Posts: 10,029
Car Info: 02 Impreza WRX sedan
Origami posted by DashingMax
300+ crank HP with exhaust NO louder than stock on a 2004 WRX...
Possible? If yes, HOW?
Absolutely, positively, quiet ride at all times...during idle, WOT, cruising, etc.
300+ crank HP with exhaust NO louder than stock on a 2004 WRX...
Possible? If yes, HOW?
Absolutely, positively, quiet ride at all times...during idle, WOT, cruising, etc.
Simply adding significant power to an engine will make for a louder sounding exhaust at WOT with no changes to the exhaust system. I found this out firsthand when I went from a 427 cu. in engine in my Camaro to a 481 cu. in. engine using the same exhaust. Similar results when I put an upgraded ECU into my turbo GLHS Omni. Both louder at WOT.
Most of the aftermarket exhausts use a straight-through muffler design, which is best for power, not for noise attenuation. The aftermarket has not really embraced baffled high-flow designs like Flowmaster (which, incidentally does or did offer an axleback exhaust for the WRX).
It must be possible to make 300 crank horsepower and still retain a quiet exhaust - the STi does it. I think use of a high-flow resonator in addition to the usual muffler is mandatory in any system where quiet performance is desired. Both the Borla Hush and the Vishnu exhausts utilize a resonator, as do a few others. Just make sure that the resonator inside diameter is the same as the exhaust pipe i.d.
--
0==WW==0
"…axles of evil…" - george w. bush
12-17-2003, 08:11 AM
#10
Guest
Posts: n/a
easily done... buy an sti 
otherwise, id personally reccommend a stealthback exhaust (i like turboxs) uppipe, i/c hoses, panel filter, pulley, and and some form of engine management. cobb = conservative and cheap, utec = DIY. i think with that setup youd be quiet enough (not quite stock sounding tho
), and right in the neighboorhood of a safe ~300hp at the crank
otherwise, id personally reccommend a stealthback exhaust (i like turboxs) uppipe, i/c hoses, panel filter, pulley, and and some form of engine management. cobb = conservative and cheap, utec = DIY. i think with that setup youd be quiet enough (not quite stock sounding tho
), and right in the neighboorhood of a safe ~300hp at the crank
12-18-2003, 10:58 AM
#14
Registered User
Thread Starter
Join Date: Sep 2003
Location: Chicago, IL
Posts: 17
Car Info: 1999 Supercharged Maxima
Originally posted by 1fastGC
it is impossible to keep your car quiet at idle, WOT and cruising while achieving over 300+ whp. hahahaha if you did, please send me a PM. I want to know HOW!
it is impossible to keep your car quiet at idle, WOT and cruising while achieving over 300+ whp. hahahaha if you did, please send me a PM. I want to know HOW!
Thanks.
12-18-2003, 11:25 AM
#15
Guest
Posts: n/a
I have an '02 MBP WRX that's pushing 300hp to the crank and about 250hp to the wheels. I have the 3" APS turbo back exhaust and I absolutely love the sound. Low rumble at idle and a near stock sound crusing and sightly louder at WOT. You'll hear hear more engine than exhaust note at all times.
It looks great and the quality is top notch. I know that you are into JDM but you may want to consider adding a little Aussie flavor to the mix.
Here's a link if you want to check out the exhaust...
http://www.airpowersystems.com.au/us...wrx-hoe-r1.htm
1 fast GC, my engine mods are:
APS SR30 Turbo
APS Dual Entry TMIC
APS BOV
APS Intake
APS 3" Turbo Back Exhaust
Unichip
It looks great and the quality is top notch. I know that you are into JDM but you may want to consider adding a little Aussie flavor to the mix.
Here's a link if you want to check out the exhaust...
http://www.airpowersystems.com.au/us...wrx-hoe-r1.htm
1 fast GC, my engine mods are:
APS SR30 Turbo
APS Dual Entry TMIC
APS BOV
APS Intake
APS 3" Turbo Back Exhaust
Unichip