No Muffler

Joey_08sti · 05-06-2008, 01:12 AM

would it be bad to drive with no muffler. im thinking it would be alot louder. also pros/cons wit no muffler

Wales Garage · 05-06-2008, 03:45 AM

no pro other than a loud exaust. +1 on con for exaust db tickett.

JuggernautTCW · 05-06-2008, 04:59 AM

it will be INSANELY loud... like louder than those harley davidson bikes... its gonna be a cop magnet.

Knuckleball22 · 05-06-2008, 05:06 AM

I have no muffler and it's not that loud. I welded up a temporary exhaust until I go stage 2. Theres a cat and a turbo and both quiet the exhaust significantly.

renns · 05-06-2008, 06:11 AM

On the stock turbo you'll lose power.

I have dyno graphs to prove it

waktasz · 05-06-2008, 06:22 AM

Quote:

Originally Posted by renns

On the stock turbo you'll lose power.

I have dyno graphs to prove it

I would like to see those

.

I'm running a small 2.25" pipe that replaced the big heavy muffler. Is the power loss significant?

renns · 05-06-2008, 06:33 AM

I have the dyno graphs at home and I'll upload them, but long story short the straight pipe made about 10 less peak whp and 30 less whp throughout the top end... spooled the turbo about 2-300 rpm later too. Keep in mind it was tuned for the straight pipe, not just a bolt on job. When I switched to my other exhaust (Cobb full 3" with mufflers) and re tuned it, I made the 10 peak and 20 top end whp.

Interesting stuff. My tuner and I have a theory that the noise from the straight pipe was setting off the knock sensor and causing it to pull timing though... so that could be part of the power loss. Search 'straight pipe STi' on youtube and you can hear it...

waktasz · 05-06-2008, 06:37 AM

Interesting.

After an evo school and an autocross event this weekend my car felt like it was running crappy, and it took an ECU reset for it to feel right again. I wonder if you're onto something here.

ps- search for homemade 08 sti exhaust to see mine.

Joey_08sti · 05-06-2008, 02:14 PM

but with no muffler it wont mess up the car will it

chmura · 05-06-2008, 02:21 PM

Wouldn't one consider this setup with no muffler? Perrin and Cobb both have the big muffler at the rear of the car just like the stock setup.

This is AMR's setup. I won't what gains and sounds this setup will provide?

**tyler_sti** · 05-06-2008, 02:26 PM

Well I could stick my hand completely in my invidia n1 race exhaust. Which means NO restriction. So how would just not having the last axle back part be non benificial? Just trying to comprehend it...Not saying you would gain, but why would you lose?

waktasz · 05-06-2008, 02:38 PM

The only problem with that is the midpipe points the exhaust right into the back of the bumper. You need a turn down or something to direct that exhaust somewhere. Here's mine. YouTube - 08 STI Home made exhaust

**tyler_sti** · 05-06-2008, 05:08 PM

Well just tried out the no axle back thing. Holly cow! I couldnt stop smiling!!!! I herd my baby puur again. Reminds me of my n1 days(sighs in remorse)... As for boost I gained another psi like I should. With stock axle back I would be down 1 psi from my target 18.5 cobb map. Now im back where I should be. Im running a helix catted downpipe and stock midpipe, sounds a little quiter than my n1. But alot more mini back fires. WOT sounds like I have an external waste gate. Sounds to sick for words. All get a video up probly by tomorow. As of right now, I just found a cheap substitute for a catback.

OH8STI · 05-06-2008, 07:12 PM

i'm did the same thing, took off the muffler, but the force from the opening was so hard it blew one of reflectors out!!! The welding of the flange should be done tomorrow, and ill try to post up pics and a vid asap. it sounds very very good.

1loudsti · 05-06-2008, 07:19 PM

im not running any muffler at all and the butt dyno says its quicker

bellmouth catless 3inch all the way back resonated tip

05-06-2008, 01:12 AM	#1
Joey_08sti Junior STI Driver Car: White 08 WRX STI Fav Mod: Magnaflow Catback Location: Los Banos,CA (209) Posts: 56 Join Date: Mar 2008 Trader Rating: (0)	No Muffler would it be bad to drive with no muffler. im thinking it would be alot louder. also pros/cons wit no muffler This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by Joey_08sti : 05-06-2008 at 01:25 AM.

05-06-2008, 03:45 AM	#2
Wales Garage Junior STI Driver Car: 08 OBP STi Fav Mod: Boobies........oh, for a car Boost Location: Hunting DrewBears<3 Posts: 118 Join Date: Nov 2007 Trader Rating: (0)	Re: No Muffler no pro other than a loud exaust. +1 on con for exaust db tickett.

05-06-2008, 04:59 AM	#3
JuggernautTCW Senior STI Driver Car: Silver 05 WRX Sedan Fav Mod: Stage 2 w/ Uppipe Location: Newton, MA Posts: 303 Join Date: Dec 2007 Trader Rating: (0)	Re: No Muffler it will be INSANELY loud... like louder than those harley davidson bikes... its gonna be a cop magnet.

05-06-2008, 05:06 AM	#4
Knuckleball22 Amateur STI Driver Car: Black 07 STI Fav Mod: Cobb AP V2 Location: Lykens, Pennsylvania Posts: 10 Join Date: Jan 2008 Trader Rating: (0)	Re: No Muffler I have no muffler and it's not that loud. I welded up a temporary exhaust until I go stage 2. Theres a cat and a turbo and both quiet the exhaust significantly.

05-06-2008, 06:11 AM	#5
renns Silver Member Car: 04 JBP STi Fav Mod: I do meth... Location: NJ Posts: 371 Join Date: Nov 2007 Trader Rating: (4)	Re: No Muffler On the stock turbo you'll lose power. I have dyno graphs to prove it

05-06-2008, 06:33 AM	#7
renns Silver Member Car: 04 JBP STi Fav Mod: I do meth... Location: NJ Posts: 371 Join Date: Nov 2007 Trader Rating: (4)	Re: No Muffler I have the dyno graphs at home and I'll upload them, but long story short the straight pipe made about 10 less peak whp and 30 less whp throughout the top end... spooled the turbo about 2-300 rpm later too. Keep in mind it was tuned for the straight pipe, not just a bolt on job. When I switched to my other exhaust (Cobb full 3" with mufflers) and re tuned it, I made the 10 peak and 20 top end whp. Interesting stuff. My tuner and I have a theory that the noise from the straight pipe was setting off the knock sensor and causing it to pull timing though... so that could be part of the power loss. Search 'straight pipe STi' on youtube and you can hear it...

05-06-2008, 06:37 AM	#8
waktasz Professional STI Racer Car: 08 STI Family Wagon Fav Mod: Autotrader.com Location: Philly Posts: 732 Join Date: Jan 2006 Trader Rating: (0)	Re: No Muffler Interesting. After an evo school and an autocross event this weekend my car felt like it was running crappy, and it took an ECU reset for it to feel right again. I wonder if you're onto something here. ps- search for homemade 08 sti exhaust to see mine.

05-06-2008, 02:14 PM	#9
Joey_08sti Junior STI Driver Car: White 08 WRX STI Fav Mod: Magnaflow Catback Location: Los Banos,CA (209) Posts: 56 Join Date: Mar 2008 Trader Rating: (0)	Re: No Muffler but with no muffler it wont mess up the car will it

05-06-2008, 02:21 PM	#10
chmura STI Driver Car: 07 Lexus IS250 Fav Mod: Future 09 STI Owner :) Location: Orange County, CA Posts: 206 Join Date: Dec 2007 Trader Rating: (0)	Re: No Muffler Wouldn't one consider this setup with no muffler? Perrin and Cobb both have the big muffler at the rear of the car just like the stock setup. This is AMR's setup. I won't what gains and sounds this setup will provide?

05-06-2008, 02:26 PM	#11
tyler_sti Gold Member Car: '07 CMG STI Fav Mod: carbing subframe, driving experience:) Location: los angeles Posts: 3,058 Join Date: Aug 2006 Trader Rating: (11)	Re: No Muffler Well I could stick my hand completely in my invidia n1 race exhaust. Which means NO restriction. So how would just not having the last axle back part be non benificial? Just trying to comprehend it...Not saying you would gain, but why would you lose?

05-06-2008, 02:38 PM	#12
waktasz Professional STI Racer Car: 08 STI Family Wagon Fav Mod: Autotrader.com Location: Philly Posts: 732 Join Date: Jan 2006 Trader Rating: (0)	Re: No Muffler The only problem with that is the midpipe points the exhaust right into the back of the bumper. You need a turn down or something to direct that exhaust somewhere. Here's mine. YouTube - 08 STI Home made exhaust

05-06-2008, 05:08 PM	#13
tyler_sti Gold Member Car: '07 CMG STI Fav Mod: carbing subframe, driving experience:) Location: los angeles Posts: 3,058 Join Date: Aug 2006 Trader Rating: (11)	Re: No Muffler Well just tried out the no axle back thing. Holly cow! I couldnt stop smiling!!!! I herd my baby puur again. Reminds me of my n1 days(sighs in remorse)... As for boost I gained another psi like I should. With stock axle back I would be down 1 psi from my target 18.5 cobb map. Now im back where I should be. Im running a helix catted downpipe and stock midpipe, sounds a little quiter than my n1. But alot more mini back fires. WOT sounds like I have an external waste gate. Sounds to sick for words. All get a video up probly by tomorow. As of right now, I just found a cheap substitute for a catback.

05-06-2008, 07:12 PM	#14
OH8STI Lurker Car: AW/Gold 08 STI stg1 Fav Mod: AP Location: Columbus, Ohio Posts: 5 Join Date: Mar 2008 Trader Rating: (0)	Re: No Muffler i'm did the same thing, took off the muffler, but the force from the opening was so hard it blew one of reflectors out!!! The welding of the flange should be done tomorrow, and ill try to post up pics and a vid asap. it sounds very very good.

05-06-2008, 07:19 PM	#15
1loudsti Professional STI Driver Car: CGM 05 Fav Mod: cobb ap v2 w/ LC Location: racine,wi Posts: 464 Join Date: Mar 2008 Trader Rating: (1)	Re: No Muffler im not running any muffler at all and the butt dyno says its quicker bellmouth catless 3inch all the way back resonated tip This ad is not endorsed by this member. Please register or login to hide this ad.