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  #25  
Old 02-12-2014, 06:47 AM
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Re: Magnaflow Exhaust

Track times do lie if they are not done under carefully controlled conditions just the same as a dyno. I have been on many many car forums. Still am, I'm a car guy. I have never seen anyone prove out a gain from a cat back on a newer car, not on the dyno, not on the track. Not too long ago it was routine but OEMs dont leave 15 or 20 free hp in the cans anymore because they cant, CAFE wont allow for it.
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Old 02-12-2014, 07:14 AM
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Re: Magnaflow Exhaust

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Originally Posted by crabman View Post
Track times do lie if they are not done under carefully controlled conditions just the same as a dyno. I have been on many many car forums. Still am, I'm a car guy. I have never seen anyone prove out a gain from a cat back on a newer car, not on the dyno, not on the track. Not too long ago it was routine but OEMs dont leave 15 or 20 free hp in the cans anymore because they cant, CAFE wont allow for it.
you be surprised then, the stock manifolds on the 3.7 are horribly restricted. going to headers was extremely noticeable especially from 3000 rpm's and up. but don't you think this thread is gone off topic tho. (I know, it's my fault on that) but its about magnaflows. that said I do have a pair of magnaflows on mine. BTW while the cans are not always the culprit, in that I agree, the stock manifolds are typically junk and that's where most of the power can be had. you misunderstood my comment when I said my exhaust setup it 15 to 20, you were thinking just a cat back. I have a full headers back custom setup. so again, I put money on 15 to 20hp from MY exhaust
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Old 02-13-2014, 07:35 AM
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Re: Magnaflow Exhaust

Your car is not a latest gen car and you are talking about a little bit of pipe and a couple cans here, not a complete system. Latest gen cars use cans that do not represent any significant restriction to the upstream exhaust flow. Get into the cats or install headers and you are talking about making real power. Do that and then change the cat back and you may get some power from it because the stock system downstream was designed to be just good enough for the stock system upstream.

Don't get me wrong, I love this stuff and I've done a lot of exhaust surgery. I'm kinda sad to see it coming to this but I can't ignore the realities either.
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Old 02-13-2014, 08:19 AM
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Re: Magnaflow Exhaust

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Originally Posted by crabman View Post
Your car is not a latest gen car and you are talking about a little bit of pipe and a couple cans here, not a complete system. Latest gen cars use cans that do not represent any significant restriction to the upstream exhaust flow. Get into the cats or install headers and you are talking about making real power. Do that and then change the cat back and you may get some power from it because the stock system downstream was designed to be just good enough for the stock system upstream.

Don't get me wrong, I love this stuff and I've done a lot of exhaust surgery. I'm kinda sad to see it coming to this but I can't ignore the realities either.

Well I do have a full system, I have headers, custom mids, resonator, and magnaflows. all true duals.

but on modern cars, a good catback with a little bit larger diameter pipe, high flow cats and headers. but I do agree that ON NEWER cars the factory systems are fairly decent. but I do think they can be improved upon. Problem with trying headers on new cars is that they are starting to go with integrated manifolds in the cylinder heads. the pentastar is like this. if you look at the 3.6 heads there is no manifold, its a single pipe off each bank. GM's 3.6 is the same way.
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Old 02-13-2014, 09:11 PM
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Factory can always and will always be able to be improved upon. They have to meet pollution and sound limits with their mufflers. Makes it pretty easy for aftermarket companies to make a free flowing exhaust. Mangaflows policy is if it doesn't make power, they will not produce it. They just don't say if its 0.5hp or 20. Apples to Oranges, but I added a catback on a previous car that netted me over 5% increase in hp, which equaled 11whp(dyno measured) With this one, I'll be happy with just an increase in sound. If the butt dyno picks up a diff, I'll consider that an added benefit.
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