RE: Alpha Exhaust... BIG DISAPPOINTMENT!

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RE: Alpha Exhaust... BIG DISAPPOINTMENT!

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/9/2008 9:36:38 PM

importkiller

Posts: 7254
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$430 sounds fair, I have had exhaust done by the same guy for my last 12 cars/trucks so he cuts me a break....I could have the h3 done for $300 through him. I just didn't like the sound of a flowmaster 40 on the I5 so I never had it done.

I've had the atlas II sitting in my shop for a year or so now, got it from a junked truck for $350. The junkyard guy had no idea what it was, guess I got lucky. Now I just need a truck to put it in. I'm hoping that sometime in the future I'll have enough money saved up to buy an old 1970's Chevy 1/2 ton pickup with a 454 and rebuilt it, then I'll use the atlas in that....the way things are going I don't see that kind of extra cash for a long long time

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 9:05:55 AM

alphadogg

Posts: 358
Joined: 12/30/2007
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quote:

ORIGINAL: importkiller
I agree...I hate the stock muffler position on all the h3's. I assume the alpha is similiar.

My bro-in-law has a 07' I5 so I will look to see if the muffler position is the same as my 08' Alpha.

The Alpha has 4 cats and I'm wondering if removing the one midships and replacing it with a hi-flow muffler would screw up the computer. If not, then I'd like to do just that, a single hi-flow muffler with dual tailpipes straight out the back, all stainless of course.

But then I'd still need a hi-flow intake or air filter to compliment the exhaust. Nothing available yet!
AIR IN, AIR OUT

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Post #: 17

RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 9:26:36 AM

importkiller

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even if it does have 4 cats...which I don't believe it does, but haven't seen it so I'm not sure. But even if it does have 4 cats the rear ones are more than likely not monitored...just won't build up enough heat for an 02 sensor to function properly back there.

I don't understand the 4 muffler thing...I assume there is one in each manifold, does the manifold go into a collector then there is one pipe going back? Or is it true duals going back? I think there is only single pipe back so where are the other two cats? Two in manifolds, one after collector about mid frame then one near the rear axle? IF that is the setup you have then the one by the rear axle is not a cat...it's a resinator...completely different part and not monitored by the PCM.

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 9:30:39 AM

rhill20

Posts: 4548
Joined: 10/27/2007
From: Delaware, Ohio GO BUCKS!
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I don't know about the I5's and it's too damned cold and windy out there right now to go look. But looking at the Gibson diagram for thier exhaust it only shows the muffler and pipes from the front CAT back. Seeing as how alot of guys on here have it, I'm asuming it doesn't cause a problem. None of them have said anything about it.

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 9:44:35 AM

importkiller

Posts: 7254
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the I5 has a manifold cat, an front inline cat and a rear resinator....the gibson exhaust removes the resinator and puts a muffler in it's place, then runs dual pipes to the rear bumper. This is the ideal setup IMO...the resinator does nothing but quiet the exhaust and is not monitored. A lot og guys confuse the two but the resinator is completely different.

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 10:17:41 AM

alphadogg

Posts: 358
Joined: 12/30/2007
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quote:

ORIGINAL: importkiller

even if it does have 4 cats...which I don't believe it does, but haven't seen it so I'm not sure. But even if it does have 4 cats the rear ones are more than likely not monitored...just won't build up enough heat for an 02 sensor to function properly back there.

I don't understand the 4 muffler thing...I assume there is one in each manifold, does the manifold go into a collector then there is one pipe going back? Or is it true duals going back? I think there is only single pipe back so where are the other two cats? Two in manifolds, one after collector about mid frame then one near the rear axle? IF that is the setup you have then the one by the rear axle is not a cat...it's a resinator...completely different part and not monitored by the PCM.

importkiller,
I really don't know much about it and I'm going on what my guy at the shop told me. Check this out here: http://www.hummerforums.com/m_130027/tm.htm Are you saying that the muffler looking thing midframe is actually a resinator? Could the Alpha actually have two cats and two resinators? I'm going to a New Hummer Owners Seminar on the 27th and maybe I can ask someone about that.

rhill20,
Samesame here! It's nasty out otherwise I'd go take some photos of the exhaust system and post them but I don't feel like laying in the snow.

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Post #: 21

RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 10:32:32 AM

importkiller

Posts: 7254
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unless there is a picture of the system it's hard to say. I just don't see how a cat would work that far back...cats work on heat...they need heat to get the "waffle" inside to do their job of filtering out the nitrogen. On a cold car the cat does absolutely nothing until it heats up, this is why most are placed as close to the motor as possible without getting it so hot that the element gets burnt up. Automakers have played with the idea of using an electric heating element to have the cat already warmed when you first start your car but nothing has come of that....so that being said I don't see why GM or any brand would put a cat that far back in the system cause it wouldn't work. There was actually a company making a high performance exhaust for the new lancer and they swore there was a cat right by the rear axle till I took mine off and cut it in half...it was just a resonator, just like I assume is on the alpha. ...My guess without seeing it is that there are two cats in the manifold...not really traditional cats, new technology, then there is a mid stream cat with a up flow sensor then a resonator then the muffler

< Message edited by importkiller -- 2/10/2008 10:38:38 AM >

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 10:41:04 AM

rhill20

Posts: 4548
Joined: 10/27/2007
From: Delaware, Ohio GO BUCKS!
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Would there be a reason NOT to go with the Dual Extreme? The one where the tailpips come out on the sides (one on each side). Was thinking (I have one of those trailer hitch baskets) that it would be better so as not to melt my cover on the basket carrier.

< Message edited by rhill20 -- 2/10/2008 10:49:29 AM >

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 10:42:08 AM

ALPHA XY

Posts: 122
Joined: 12/9/2007
From: Rockville, MD
Status: offline

I really have to take the camera out and get under the Alpha...but it is waaaay to windy for that today!!

I think I am just going to build my own system. Catback, flowmaster 40 or 44 placing it where the res is now and running strait out the pass side (like the H2 aftermarkets).

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 10:48:32 AM

importkiller

Posts: 7254
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quote:

ORIGINAL: rhill20

Would there be a reason NOT to go with the Dual Extreme? The one where the tailpips come out on the sides (one on each side). Was thinking (I have one of those trailer hitch baskets) that it would be better so as not to melt my cover on the basket carrier.

kinda like what I had on my Dodge

I like that setup...looks cool IMO

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 11:00:14 AM

ALPHA XY

Posts: 122
Joined: 12/9/2007
From: Rockville, MD
Status: offline

I like that set up, but not sure how much room is there to run the driver side strait out? Has anyone seen (at least on the Alpha) what GM did to get the pipe over to pass side pipe???? I've gotta take a picture of this?!

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 11:02:11 AM

importkiller

Posts: 7254
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there's no spare tire back there or fuel tank, should be easy to bend a pipe across to that side.

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 11:03:59 AM

TheGunnyRet

Posts: 302
Joined: 11/21/2007
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It sounds like the exhaust on the mid 90s Mustang with the 4 cats right after the exhaust manifolds.
Resonators usually come after the muffler, if the're before the muffler then there is not much to them and act more like an expansion chamber.
If you have O2 sensors forward and aft of the cats then you will have problems with hi-flow cats with the CEL.
You might want to give it some time before chopping up your exhaust, I mean the Alpha just came out. Pics would help greatly though.

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 11:08:21 AM

importkiller

Posts: 7254
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that's not really true about resonators coming after the muffler.....ALL import cars that have the can muffler at the bumper have a resonator near the rear axle. Same thing on the old chevy beretta, there was a cat, resonator then can muffler at the bumper. Most cars with rear mounted mufflers have a forward mounted resonator...look at the link Doc gave for the I5 exhaust and you'll see a forward mounted resonator then the rear mounted muffler.

< Message edited by importkiller -- 2/10/2008 11:13:38 AM >

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RE: Alpha Exhaust... BIG DISAPPOINTMENT! - 2/10/2008 11:17:15 AM

rhill20

Posts: 4548
Joined: 10/27/2007
From: Delaware, Ohio GO BUCKS!
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quote:

ORIGINAL: importkiller

quote:

ORIGINAL: rhill20

Would there be a reason NOT to go with the Dual Extreme? The one where the tailpips come out on the sides (one on each side). Was thinking (I have one of those trailer hitch baskets) that it would be better so as not to melt my cover on the basket carrier.

kinda like what I had on my Dodge
I like that setup...looks cool IMO

That's exactly the one I'm talking about.

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< Message edited by rhill20 -- 2/10/2008 11:24:14 AM >

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