12-08-2009, 06:25 PM
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#1
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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catless?
I'm sure I could search but I'm on my phone. Simple question. Can I run without a cat without any issues other than a light? Some unexpected bills hurt the budget and I'm litterally in the middle of doing my exhaust.
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GX Coupe
Dropped and Blown
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12-08-2009, 06:29 PM
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#2
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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uh... duh lol
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12-08-2009, 06:38 PM
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#3
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GLS member
Join Date: Aug 2006
Location: Grand Forks, ND for school; Langdon, ND home
Posts: 2,632
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yep, just don't go do any inspections and deal with the light. it'll be fine til you get one.
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2001½ F150 XLT Crew Cab- true dual glasspacks with x-pipe, AEM intake, SCT X3 with VMP custom tunes, full stereo system, HID 55w heads and 35w fogs, 35% tint front and 20% rear, Lightning tail lights
04 F6 Sno Pro Team edition- MBRP race can, ODS clutch kit
01 YZ125- bored out to 144, PnP cylinder and head, Pro Circuit WORKS suspension, many other mods
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12-08-2009, 06:40 PM
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#4
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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Hey cut me some slack. I work at a caddy dealership. I'm used to seeing cars run like shit or go into limp mode with a hollowed cat. :P Just wanted to make sure our ecm isn't as anal. Haha.
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GX Coupe
Dropped and Blown
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12-08-2009, 06:43 PM
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#5
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GLS member
Join Date: Mar 2007
Location: Tx
Posts: 1,295
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Yes it just helps filter the exhaust so without it your car will smell ugly out the muffler. Oh and dont forget it will sound like shit.
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12-08-2009, 06:44 PM
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#6
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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shouldn't happen on any car. the rear O2 doesn't do anything but monitor how well the cat is converting the dangerous gases. that's stupid if the PCM would take any action based on that.
Quote:
Originally Posted by DOHC_tuner
Yes it just helps filter the exhaust so without it your car will smell ugly out the muffler. Oh and dont forget it will sound like shit.
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Yeah mine sounds like shit right? It's the quietest thing ever when I don't have the cutout open. Even with the cutout open it's not too crazy.
Cutout open: http://www.youtube.com/watch?v=RlbcASDGdy8
Cutout closed: http://www.youtube.com/watch?v=ayHajgTw8XY
(old video, BOV sounds cleaner now. new vid with flyby's soon)
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12-08-2009, 06:53 PM
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#7
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GLS member
Join Date: Mar 2007
Location: Tx
Posts: 1,295
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A boosted car is different....Im referring to a N/A car.
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12-08-2009, 07:03 PM
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#8
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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Quote:
Originally Posted by DOHC_tuner
A boosted car is different....Im referring to a N/A car.
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N/A car with the same mufflers I have is quiet too. Not near as quiet as a turbocharged one, but still the least obnoxious it can be without a cat.
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12-08-2009, 06:55 PM
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#9
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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I've got a 24" resonator off a northstar STS to keep shiity sound to a minimum. 2.5" diameter so it mates to the header downpipe perfectly.
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GX Coupe
Dropped and Blown
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12-08-2009, 09:59 PM
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#10
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GLS member
Join Date: Mar 2007
Location: Tx
Posts: 1,295
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Well I prefer to run with a cat.
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12-08-2009, 11:37 PM
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#11
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V.I.P. Member
Join Date: Jul 2004
Location: Kalamazoo, MI
Posts: 477
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It is a fact that some cars will run slower times with the cat removed. Back pressure is necessary.
I assume that this is the same case with aleros?
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12-11-2009, 02:05 PM
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#12
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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Exhaust is on. The caddy resonator measured up alright but, once welded up, there wasn't enough clearance to keep it from rattling against the underside. So I the shop ran 2.5" header back to a Dynomax super turbo. Sounded like tin-canned shit. They put a glass pack in line as a resonator and it smoothed it out a lot. It's still louder then I wanted though. It sounds pretty deep and not the typical honda BrapBrapBrap sound, but I still may have to swap in a straight-thru muffler in place of the glass pack to quiet it down a little bit more. I'll have to see how well the muffler breaks in. My tip also seems a bit too large now that it's on the car. bah!
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GX Coupe
Dropped and Blown
Last edited by Th0r : 12-11-2009 at 02:07 PM.
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12-11-2009, 02:18 PM
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#13
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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Weird. I have a magnaflow straight through 4" can before the Dynomax Super Turbo (Camaro style)
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12-11-2009, 03:09 PM
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#14
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GL Member
Join Date: Jan 2009
Location: Fowlerville MI
Posts: 874
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i love my dynomax super. sounds nothing like a typical 4 cylinder
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[ion] C2 - I ran her hard, on nothing but the bare ground. After easing into it and progressively pushing down harder I could feel the pressure building and once it peaked I let off and she gave a loud cry from the blow off valve.
Ttop191 - ^ because your car is the only thing that will suck and blow that you can actually successfully get within 25 feet of
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12-11-2009, 03:21 PM
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#15
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GX Member
Join Date: May 2008
Location: FL
Posts: 216
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Ion, so you have both mufflers behind your bumper, or is one mid-body? I probably will go with a 4" magnaflow once money gets better.
On another note, I found this on j-body and it seems to be working for my downstream 02 sensor. You need 2 18mm spark plug anti-foulers. the HELP! part number is 42009. $6 and no CEL. Gotta read to get the full info since it's old and links are broken. http://www.j-body.org/forums/read.ph...5&t=309456&p=1
One thing is for sure, I have more pull in the top end and I like it. I'll post pics later.
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GX Coupe
Dropped and Blown
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12-11-2009, 05:35 PM
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#16
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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The Magnaflow straight through can is mid-body right after my cutout. Both of those together seem to be nice and quiet yet still high flow.
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01-20-2010, 05:50 PM
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#17
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GL Member
Join Date: Sep 2009
Location: Iowa
Posts: 978
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ok i found a dumby o2 sensor, google an o2 sensor eliminator they are like $50 on ebay
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stock 2.4 -building a WAI to a CAI 3A Racing muffler- ~Kicker Door speakers and Power Accustic rear speakers 10% tint 18x7.5 Alt Sonix, 2001 GLS sedan
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01-20-2010, 07:07 PM
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#18
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Let's Play Army!
Join Date: Nov 2003
Location: Lockport, NY
Posts: 8,475
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ion, what kind of performance differences do you see with the cutout open vs closed? (numbers if possible)
when I had broken exhaust (basically open pipes) it felt like about 5-10 seat hp more; but sounded like shit (but I've always been NA). Now I have Pacesetter headers, magnaflow cat, magnaflow straight-through (mid-body) and a Borla Pro-XS behind the axle and sounds pretty nice, but the performance feels like just a more-peppy OEM.
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Quote:
Originally Posted by black
holy crap, i just farted at work and the whole office stinks!!!!
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RIP to my Alero @ 112000 miles. COD: thrown rod. TOD: 430pm, Dec19, 2011.
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01-20-2010, 07:27 PM
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#19
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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Dunno, don't feel any difference really. It's loud and sounds insane at WOT... I can do an open vs. closed test at the track in the spring, but it will probably be a minimal difference.
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01-20-2010, 08:37 PM
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#20
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The Aleromod PITA
Join Date: Feb 2009
Location: East Carolina University, GVegas, NC
Posts: 1,852
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speaking of cats, isnt it tme for some of the first aleros not to need cats after 2013 or 14, no emissions tests on inspections?
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