- #61 of 90
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Re: Why 3 catalytic converters on my avenger [paisan]
by 0patience
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Apr 27, 2007 (6:05 pm)
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Replying to: paisan (Apr 27, 2007 8:48 am)
Ok, I made my statement too broad I guess.
Only approved replacment parts may be used, which some cat back systems and high flows are approved.
Removing a cat would be a violation.
Removing the pre-cats/mini-cats on his vehicle would be a violation.
If there is no DEQ inspection, then that may be a different story for them. Federal guidelines talk about alterations, removal and that, but their state may have other guidelines that they go by.
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- #62 of 90
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Anmy downside to Magnaflow exhausts?
by oldfarmer50
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Jun 07, 2007 (3:13 pm)
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I was looking at the Magnaflow web site and according to them it will boost my hp by 11 and increase torque almost as much. Plus it has a nice sound.
My question, is there any downside to these systems such as lower gas mileage? Would the intake need to be modified in any way?
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- #63 of 90
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Re: Anmy downside to Magnaflow exhausts? [oldfarmer50]
by okko1
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Jun 07, 2007 (3:40 pm)
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Replying to: oldfarmer50 (Jun 07, 2007 3:13 pm)
well the way it works with me is the better it sounds the faster i drive it and the fuel mileage seems to follow a downward trend. but if it sounds cool thats what your buying you will never feel the hp or torque at 11 anyway
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- #64 of 90
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Re: Anmy downside to Magnaflow exhausts? [oldfarmer50]
by Mr_Shiftright HOST
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Jun 07, 2007 (10:04 pm)
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Replying to: oldfarmer50 (Jun 07, 2007 3:13 pm)
There is no horsepower inside a muffler. The most HP gain would be from no muffler at all. These mufflers would only increase your horsepower if your stock system were heavily restricted. If this is a cat-back system only I think those numbers are very optimistic indeed. If you are installing exhaust headers, free-flow catalytic and mufflers, then yeah, you might get 8-10 HP on a large displacement engine.
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- #65 of 90
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Re: Anmy downside to Magnaflow exhausts? [Mr_Shiftright]
by oldfarmer50
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Jun 10, 2007 (7:22 am)
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Replying to: Mr_Shiftright (Jun 07, 2007 10:04 pm)
So what you are saying is, unless you like the sound it's not worth it?
The engine in question is a 3.8L with single exhaust. Don't know if it's restricted but stock it's rated at 263hp.
The Magnaflow site has some dyno charts to "prove" the horsepower and torque gains.
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- #66 of 90
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Re: Anmy downside to Magnaflow exhausts? [oldfarmer50]
by paisan
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Jun 10, 2007 (7:26 am)
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Replying to: oldfarmer50 (Jun 10, 2007 7:22 am)
I'm going to agree with mr. shiftright. I'd look at dyno numbers on the specific exhaust on your specific car. Generally you need intake, exhaust, hi-flow cat, and catback to get 8-12hp gain. Sound of course is a different story, which is what exhaust is mostly used for in a very general terms. There are *some* exhausts that will net you 20-30hp but those cases are rare.
-mike
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- #67 of 90
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Re: Anmy downside to Magnaflow exhausts? [oldfarmer50]
by Mr_Shiftright HOST
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Jun 10, 2007 (7:43 am)
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Replying to: oldfarmer50 (Jun 10, 2007 7:22 am)
Well if these mufflers are behind the catalytic, I don't see where any horsepower is coming from unless you have a cantaloupe stuck in there or something.
I suppose if your stock muffler is restrictive you could gain maybe...what...1-2HP...but you won't feel it.
Nothing wrong if you are just buying "sound". Sound is nice. I like sound.
As for the dyno tests, this is a whole can of worms. I am not implying duplicity...sometimes it's just human error. You might find this interesting:
http://www.turbomagazine.com/tech/0402tur_dyno_tricks_problems/index.html
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- #68 of 90
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Re: Anmy downside to Magnaflow exhausts? [Mr_Shiftright]
by paisan
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Jun 10, 2007 (7:32 pm)
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Replying to: Mr_Shiftright (Jun 10, 2007 7:43 am)
What I meant in terms of dyno test are take the car stock, dyno it with the exhaust, drop the exhaust, bolt on the "new one" and re-dyno (don't even take the dyno off the car) and you might see some increases, but usually they only work in conjunction with other flow-mods (headers, Downpipes, High Flow Cats, Intake, etc)
-mike
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- #69 of 90
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Re: Anmy downside to Magnaflow exhausts? [paisan]
by Mr_Shiftright HOST
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Jun 11, 2007 (7:06 am)
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Replying to: paisan (Jun 10, 2007 7:32 pm)
Yep, you have to look at the intake/engine/exhaust as ONE BIG TUBE....if you are going to open the back end and you haven't done anything to the front or middle, your results are not going to be very fruitful. In fact, if you open the back TOO much, you'll create negative effects.
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- #70 of 90
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Re: All About Exhaust Systems [Mr_Shiftright]
by chelle26
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Sep 03, 2007 (6:51 pm)
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Replying to: Mr_Shiftright (May 10, 2005 8:25 am)
just having troubles with exhaust system..has anybody familiar with exhaust system kit canada? had someone tried installing it before or on eBay?
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