i got a question - Subaru Enthusiasts Car Club of the Sierras

Dknits782 · 2007-12-07, 06:36 PM

I went in to have a straight pipe made for my sti today and the guy said that it was pointless to run a straight pipe from the main cat back to my axel back exhaust. i thought that deleting the resonator and the one cat would allow better flow. i know its a noob question but i dont understand.

MattR · 2007-12-07, 07:26 PM

It won't gain you much of anything, except a lot of attention from the cops. Trust me I know.

Dean · 2007-12-07, 07:57 PM

The biggest obstruction is probably the diameter change at the rear axle and the muffler.

A straight pipe on an 05 will be hella noisy. I'd at least put some sort of muffler at the back.

tysonK · 2007-12-07, 08:16 PM

^Did you just use hella?

ok.

100_Percent_Juice · 2007-12-07, 08:47 PM

Quote:

Originally Posted by tysonK

^Did you just use hella?

M3n2c3 · 2007-12-08, 01:39 AM

Quote:

Originally Posted by Dean

The biggest obstruction is probably the diameter change at the rear axle and the muffler.

A straight pipe on an 05 will be hella noisy. I'd at least put some sort of muffler at the back.

I don't think he means a full straight pipe all the way to the end, just a straight (non-resonated) midpipe from DP to axleback.

But yeah, it'll still result in a noise increase, even with the same axleback on there, and probably won't gain much.

bxracer69 · 2007-12-08, 06:15 PM

I'm completely catless and i've never had a problem with any cops... But i lost the screws to my cut-out when I was home over summer one day and I thought I was gonna get arrested for sure if I saw a cop

M3n2c3 · 2007-12-08, 08:19 PM

For what it's worth, I've heard people complain that Stromung dual-tip exhausts are too loud when combined with a header and non-resonated midpipe, but I'm perfectly comfortable with mine. Haven't had a complaint from my wife, either, and never felt like I ought to add a resonator. Keep in mind that I'm normally aspirated, though.

My point is that a lot of this is purely subjective. . . I'd say if you can get it done for cheap, give it a shot.

Dknits782 · 2007-12-09, 12:44 PM

so it wouldn't really do anything performance wise. and would running 3 inch turbo back really help that much.

cody · 2007-12-09, 01:54 PM

It would set you up for when you go Stage II or higher in the future. That's one thing I like about my Borla Hush; I was able to purchase a 3" flange adapter to replace the 2.5" donut flange it came with when I went to a high flow cat. The hush uses a slip joint, no welding required.

M3n2c3 · 2007-12-09, 10:46 PM

Quote:

Originally Posted by Dknits782

so it wouldn't really do anything performance wise. and would running 3 inch turbo back really help that much.

In your case, since you have the stromung dp and an axleback, it would get you a nice straight length of exhaust to clean up diameter changes. I think you should go ahead and get it done. . . it wouldn't really hurt.

I asked Jeremy about it this afternoon, and he thinks you should go ahead and do it, too.

cody · 2007-12-09, 10:53 PM

Oh, so we're talking about going catless with a full TBE basically. Well yah, do it and then get tuned.

And watch for boost spiking.

M3n2c3 · 2007-12-09, 11:06 PM

I think he wants to keep the cat pipe, but lose the resonator in the catback. I wasn't aware that he had the dp when I first posted.

You guys have it kinda rough in a way. . . my exhaust comes in only 4 pieces.

2007-12-07, 06:36 PM	#1
Dknits782 EJ18 Join Date: May 2007 Location: Gardnerville N.V Posts: 61 Car: 05 sti	i got a question I went in to have a straight pipe made for my sti today and the guy said that it was pointless to run a straight pipe from the main cat back to my axel back exhaust. i thought that deleting the resonator and the one cat would allow better flow. i know its a noob question but i dont understand.

2007-12-07, 07:26 PM	#2
MattR El Matador Real Name: Matt Join Date: Dec 2002 Location: Reno, NV Posts: 10,660 Car: 2012 Toyota Tacoma Class: ?	It won't gain you much of anything, except a lot of attention from the cops. Trust me I know. __________________ "Dallas..We have a problem.”

2007-12-07, 07:57 PM	#3
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	The biggest obstruction is probably the diameter change at the rear axle and the muffler. A straight pipe on an 05 will be hella noisy. I'd at least put some sort of muffler at the back. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2007-12-07, 08:16 PM	#4
tysonK warehouse SECCS Join Date: Mar 2003 Location: SoCal... Posts: 6,253 Car: 04 Evo 99 Cadillac Class: street de le mod	^Did you just use hella? ok. __________________ Anjali? Anjali?

2007-12-08, 06:15 PM	#7
bxracer69 EJ22 Real Name: Nick Langkamp Join Date: Aug 2004 Location: On the Road Posts: 384 Car: 2003 Mitsubishi Evo8 Class: SM Snowboarding....Because gravity is cheaper than gas	I'm completely catless and i've never had a problem with any cops... But i lost the screws to my cut-out when I was home over summer one day and I thought I was gonna get arrested for sure if I saw a cop __________________ My better is better than your best. My fast smells like french toast. www.langkampracing.com

2007-12-08, 08:19 PM	#8
M3n2c3 EJ205 Real Name: Jeremiah Join Date: Jul 2005 Location: Lubbock, TX Posts: 1,888 Car: Current: 2014 Forester 2.5i Premium. Old: 2005 Impreza 2.5RS, 2000 Forester L Class: RNP, long ago (see motto) "Kids are ruining autocross."	For what it's worth, I've heard people complain that Stromung dual-tip exhausts are too loud when combined with a header and non-resonated midpipe, but I'm perfectly comfortable with mine. Haven't had a complaint from my wife, either, and never felt like I ought to add a resonator. Keep in mind that I'm normally aspirated, though. My point is that a lot of this is purely subjective. . . I'd say if you can get it done for cheap, give it a shot. __________________ Small red text that looks curious at first glance but is ultimately inconsequential

2007-12-09, 12:44 PM	#9
Dknits782 EJ18 Join Date: May 2007 Location: Gardnerville N.V Posts: 61 Car: 05 sti	so it wouldn't really do anything performance wise. and would running 3 inch turbo back really help that much.

2007-12-09, 01:54 PM	#10
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	It would set you up for when you go Stage II or higher in the future. That's one thing I like about my Borla Hush; I was able to purchase a 3" flange adapter to replace the 2.5" donut flange it came with when I went to a high flow cat. The hush uses a slip joint, no welding required. __________________ Slow and low, that is the tempo. Last edited by cody; 2007-12-09 at 01:57 PM.

2007-12-09, 10:53 PM	#12
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	Oh, so we're talking about going catless with a full TBE basically. Well yah, do it and then get tuned. And watch for boost spiking. __________________ Slow and low, that is the tempo.

2007-12-09, 11:06 PM	#13
M3n2c3 EJ205 Real Name: Jeremiah Join Date: Jul 2005 Location: Lubbock, TX Posts: 1,888 Car: Current: 2014 Forester 2.5i Premium. Old: 2005 Impreza 2.5RS, 2000 Forester L Class: RNP, long ago (see motto) "Kids are ruining autocross."	I think he wants to keep the cat pipe, but lose the resonator in the catback. I wasn't aware that he had the dp when I first posted. You guys have it kinda rough in a way. . . my exhaust comes in only 4 pieces. __________________ Small red text that looks curious at first glance but is ultimately inconsequential Last edited by M3n2c3; 2007-12-09 at 11:14 PM.

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