Interesting Idea...looping a cat into a QTP dp back into exhaust...PIC

GSRREP · 01-09-2006, 07:29 PM

So listen to my idea I just thought up:

I am debating on whether or not to get the N1 racing catback exhaust, but i hear it is insanely loud. I want my exhaust to be insanely loud...only when I want it to be. What if I hooked up a pipe coming from the cutout that was then routed back into the midpipe (after the resonator or cat) which would theoretically make the exhaust a free flowing cattless exhaust? This is hard to explain in words as it is a picture in my head...ya know. so when the cutout is closed, exhaust flow would be going through the cat or resonator to muffle the noise, but when the cutout is open, exhaust gas is routed through the tube, around the cat or res, and then back into the midpipe. Am I crazy? or am I inovating?

RedskinSti · 01-09-2006, 07:30 PM

Why not when it is open let it just go into the atomosphere?

GSRREP · 01-09-2006, 07:41 PM

Quote:

Originally Posted by RedskinSti

Why not when it is open let it just go into the atomosphere?

because I want some "heat" coming out the back

I drew up a picture cause I have trouble understanding what I tried to describe.

RedskinSti · 01-09-2006, 08:08 PM

I think it would be more trouble then it is worth. Just get a helix catted dp and catless catback and ur set for smog and performence.

GSRREP · 01-09-2006, 08:13 PM

I am thinking of that oh so sweet plume of blue rather than conserving the environment

zedman86 · 01-09-2006, 08:16 PM

there are minor gains in hp for bypassing the cat, and also i think this idea may reek havoc on your wastegate setup since at one point there would be some more back pressure than when its open. just my $.02

RedskinSti · 01-09-2006, 08:17 PM

Quote:

Originally Posted by GSRREP

I am thinking of that oh so sweet plume of blue rather than conserving the environment

I want that plume of blue as well. My idea is to run catless and have a BOV!

pt518sti · 01-09-2006, 08:18 PM

That picture is beautiful

If you have a place that can custom make you that kind of thing for a reasonable price, and do really nice work then go for it...
If not, I'd probably say forget it

GSRREP · 01-09-2006, 08:24 PM

Quote:

Originally Posted by zedman86

there are minor gains in hp for bypassing the cat, and also i think this idea may reek havoc on your wastegate setup since at one point there would be some more back pressure than when its open. just my $.02

how is my idea any different back pressure wise than running a cutout with the stock catback?

GSRREP · 01-09-2006, 08:26 PM

Quote:

Originally Posted by pt518sti

That picture is beautiful

haha yes yes i know I'm shooting for a degree in automotive design

rv7 · 01-09-2006, 08:58 PM

Wow, that's probably one of the best AutoCAD drawings I've seen in a while.

On a serious note, I say go for it. It seems like it would work to me.

Pitcherman · 01-09-2006, 10:21 PM

Why not save yourself the money on a cat back and just get the cutout and a catless DP . Then plumb a dump tube out right behind the front pasnger wheel so you can shoot flames at the people next to you at the light.

Chris

GSRREP · 01-09-2006, 10:25 PM

wouldnt that just be loud 24/7? the whole idea is that I want a setup that goes from medium to loud with the push of a button.

Pitcherman · 01-09-2006, 10:29 PM

Quote:

Originally Posted by GSRREP

wouldnt that just be loud 24/7? the whole idea is that I want a setup that goes from medium to loud with the push of a button.

No because you're keeping the stock muffler and resonator. That way the DP will make it a little bit louder and when you open up the cut out you get the full bore boxer rumble without any restriction to speak of.

Chris

GSRREP · 01-09-2006, 11:08 PM

Quote:

Originally Posted by Pitcherman

No because you're keeping the stock muffler and resonator. That way the DP will make it a little bit louder and when you open up the cut out you get the full bore boxer rumble without any restriction to speak of.

Chris

I really like the flame out the exhaust though, kind of un-tuner like to have it come out the side you know?

01-09-2006, 07:29 PM	#1
GSRREP Professional STI Driver Car: 05 Sti Fav Mod: gt3076r Location: Beantown Posts: 423 IWSTI Addict since: Jul 2005 Trader Rating: (5)	Interesting Idea...looping a cat into a QTP dp back into exhaust...PIC So listen to my idea I just thought up: I am debating on whether or not to get the N1 racing catback exhaust, but i hear it is insanely loud. I want my exhaust to be insanely loud...only when I want it to be. What if I hooked up a pipe coming from the cutout that was then routed back into the midpipe (after the resonator or cat) which would theoretically make the exhaust a free flowing cattless exhaust? This is hard to explain in words as it is a picture in my head...ya know. so when the cutout is closed, exhaust flow would be going through the cat or resonator to muffle the noise, but when the cutout is open, exhaust gas is routed through the tube, around the cat or res, and then back into the midpipe. Am I crazy? or am I inovating? This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by GSRREP; 01-09-2006 at 08:02 PM.

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01-09-2006, 07:30 PM	#2
RedskinSti Senior STI Driver Car: 04 Subaru WRX STi Location: Gaithersburg, MD Posts: 390 IWSTI Addict since: Nov 2004 Trader Rating: (0)	Why not when it is open let it just go into the atomosphere?

01-09-2006, 08:08 PM	#4
RedskinSti Senior STI Driver Car: 04 Subaru WRX STi Location: Gaithersburg, MD Posts: 390 IWSTI Addict since: Nov 2004 Trader Rating: (0)	I think it would be more trouble then it is worth. Just get a helix catted dp and catless catback and ur set for smog and performence.

01-09-2006, 08:13 PM	#5
GSRREP Professional STI Driver Car: 05 Sti Fav Mod: gt3076r Location: Beantown Posts: 423 IWSTI Addict since: Jul 2005 Trader Rating: (5)	I am thinking of that oh so sweet plume of blue rather than conserving the environment

01-09-2006, 08:16 PM	#6
zedman86 Professional STI Racer Car: 07 xterra for now Location: San Francisco Posts: 705 IWSTI Addict since: Aug 2005 Trader Rating: (2)	there are minor gains in hp for bypassing the cat, and also i think this idea may reek havoc on your wastegate setup since at one point there would be some more back pressure than when its open. just my $.02

01-09-2006, 08:18 PM	#8
pt518sti S204 Racer Car: 2005 White/Gold STi Fav Mod: TD06-20G/Tein Flex coilovers Location: New York Posts: 2,888 IWSTI Addict since: May 2005 Trader Rating: (8)	That picture is beautiful If you have a place that can custom make you that kind of thing for a reasonable price, and do really nice work then go for it... If not, I'd probably say forget it

01-09-2006, 08:58 PM	#11
rv7 Professional STI Racer Posts: 639 IWSTI Addict since: Sep 2004 Trader Rating: (7)	Wow, that's probably one of the best AutoCAD drawings I've seen in a while. On a serious note, I say go for it. It seems like it would work to me.

01-09-2006, 10:21 PM	#12
Pitcherman STI Master Car: 04 JVP STi Fav Mod: Blitz NUR Spec R Location: B.F.E, Texas Posts: 7,985 IWSTI Addict since: Apr 2004 Trader Rating: (3)	Why not save yourself the money on a cat back and just get the cutout and a catless DP . Then plumb a dump tube out right behind the front pasnger wheel so you can shoot flames at the people next to you at the light. Chris

01-09-2006, 10:25 PM	#13
GSRREP Professional STI Driver Car: 05 Sti Fav Mod: gt3076r Location: Beantown Posts: 423 IWSTI Addict since: Jul 2005 Trader Rating: (5)	wouldnt that just be loud 24/7? the whole idea is that I want a setup that goes from medium to loud with the push of a button.