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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 01-22-2013, 09:38 PM
mikoz mikoz is offline
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Default Dod18m and magnaflow y-pipe

Hi

Wanted to share my experiences on this.
First, I have an 09 ram hemi crew with a diablo tune and a k&n cold air intake (the plastic one, can't remember the model number). Those are the only engine mods.

When I first installed the k&n cold air intake I immediately noticed:
1. Increase in throttle performance and a bit more power. I didn't measure anything, this is just my observation trying to be not biased in any way. Throttle performance and response of the cold air intake was definitely better.
2. Significantly louder, especially under moderate to heavy throttle. My wife hated it. Said it was way too loud. It was really loud by anyone's metric.
3. A definite difference in smoothness when going into and out of fuel saver mode. For the worse, that is. Transitions into and out of fuel saver were definitely more noticeable and annoying.

I bought the magnaflow y pipe and the dod18m. First the y pipe shipped from amazon with a 1/4" hole in the weld. Very disappointing quality. But I took it and the mufflex dod18m to the local performance exhaust shop. They said no big deal with the hole and they could do the y pipe and muffler for 200 in labor.

When they put the mufflex on they commented at how it was a nice kit but the inlet side of the muffler wasn't really 3", it was too small and the clamp couldn't deal with it, it had to be welded.

They also had concerns about the warranty of the cat converter when it came to installing the y pipe, but a quick call to the dealer showed that anything after the cats doesn't impact the warranty.

Anyway, after the install things really changed. Again, no real direct data to support these claims, just my observations:
1. Smoothness with fuel saver transitions. Got ten times better. Hardly noticeable now.
2. Throttle response got a lot better even after the first drive away.
3. Noise. It's actually smoother and deeper by a lot. People have commented that its actually quieter. It's not quieter, they are mistaking overall noise level with "non desirable noises" like the fuel saver transitions.
4. There is no resonance at any speed anywhere.
5. The sound is overall a lot more appealing by everyone's ear... Wife, neighbors, people who really don't care about exhaust systems.
Nothing on mpg yet, can't say if its better or worse.

Last edited by mikoz; 01-22-2013 at 09:44 PM.
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  #2  
Old 01-24-2013, 08:42 AM
Clifford17 Clifford17 is offline
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Default

Quote:
Originally Posted by mikoz View Post
Hi

Wanted to share my experiences on this.
First, I have an 09 ram hemi crew with a diablo tune and a k&n cold air intake (the plastic one, can't remember the model number). Those are the only engine mods.

When I first installed the k&n cold air intake I immediately noticed:
1. Increase in throttle performance and a bit more power. I didn't measure anything, this is just my observation trying to be not biased in any way. Throttle performance and response of the cold air intake was definitely better.
2. Significantly louder, especially under moderate to heavy throttle. My wife hated it. Said it was way too loud. It was really loud by anyone's metric.
3. A definite difference in smoothness when going into and out of fuel saver mode. For the worse, that is. Transitions into and out of fuel saver were definitely more noticeable and annoying.

I bought the magnaflow y pipe and the dod18m. First the y pipe shipped from amazon with a 1/4" hole in the weld. Very disappointing quality. But I took it and the mufflex dod18m to the local performance exhaust shop. They said no big deal with the hole and they could do the y pipe and muffler for 200 in labor.

When they put the mufflex on they commented at how it was a nice kit but the inlet side of the muffler wasn't really 3", it was too small and the clamp couldn't deal with it, it had to be welded.

They also had concerns about the warranty of the cat converter when it came to installing the y pipe, but a quick call to the dealer showed that anything after the cats doesn't impact the warranty.

Anyway, after the install things really changed. Again, no real direct data to support these claims, just my observations:
1. Smoothness with fuel saver transitions. Got ten times better. Hardly noticeable now.
2. Throttle response got a lot better even after the first drive away.
3. Noise. It's actually smoother and deeper by a lot. People have commented that its actually quieter. It's not quieter, they are mistaking overall noise level with "non desirable noises" like the fuel saver transitions.
4. There is no resonance at any speed anywhere.
5. The sound is overall a lot more appealing by everyone's ear... Wife, neighbors, people who really don't care about exhaust systems.
Nothing on mpg yet, can't say if its better or worse.
Your MPG will go way down for the first little while because you wont be able to keep your foot off the throttle
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Old 06-23-2013, 03:00 PM
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LostAtSea85 LostAtSea85 is offline
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Default

Thanks for the write-up. The y-pipe is on my top 3 list since I already have the 14" Mufflex .
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