CPE full system and noise.

[www.cp-e.com]

How long did you have the CPE catback on the MS6 before modding it? Did you completely adjust to the power so that you would easily recognize any drop-off?

The only reason I ask is that the shape of the new 12" oval muffler seems to stick out quite a bit compared to the stock 14" on that 3rd section. Also, the ends are square instead of angled to allow for smoother airflow. I would be very interested if CPE could get some dyno runs with this new muffler before offering it. Yes, it might make things dramatically quieter, but silence comes at a cost. My guess is that with the square ends you are losing some of the power. Just my $0.02.

FWIW, I posted a picture of the inside of the oval muffler in the SPEED3 forums and neglected to post it here! Anyway, here are the pictures of the oval muffler, inside and out. The inside of the oval muffler is indentical to the inside of the resonators, so the performance difference should be negligible.

Jordan

 

[mustangman]

How long did you have the CPE catback on the MS6 before modding it? Did you completely adjust to the power so that you would easily recognize any drop-off?

The only reason I ask is that the shape of the new 12" oval muffler seems to stick out quite a bit compared to the stock 14" on that 3rd section. Also, the ends are square instead of angled to allow for smoother airflow. I would be very interested if CPE could get some dyno runs with this new muffler before offering it. Yes, it might make things dramatically quieter, but silence comes at a cost. My guess is that with the square ends you are losing some of the power. Just my $0.02.

Mdogg, what do you mean "square ends"? The oval muffler is, oval in shape, and straight through design. (Jordan, maybe you could post a picture or two of this muffler. I didn't think to do it before installation.) You could mean that the 12" muffler isn't flush and is mounted sideways... I don't see how this would increase any power loss.

Anyway, I had the system for 1 week before the 12" install, and I drive for a living so I spent quite a bit of time in the car in that one week. At max, I'd say.... MAX 5 hp loss.

If this was a chambered muffler I could understand your thoughts, but with a straight through design, power loss isn't coming from adding this muffler. It only helps the sound, because it acts like a resonator (bouncing the sound off the muffler packing to minimize noise.) but in larger form. (12" oval vs. 14" long x 6" wide resonator) Here are two pictures also to show it from ground level, and inside the opening. I hope this helps Mdogg. If not, Jordan is watching this post, he may be able to help as well.

Lastly, imo, if you want pure power and don't care about how loud it is, go with the regular system. But if you want power and want it a bit quieter, this is one way to go. I just want to help anyway I can. Thanks again though for the great question and I hope I answered them.

 

[mustangman]

LOL, Jordan, are you reading my mind now? As soon as I clicked "submit" asking for pics, the are already there.... (thumb)

Jim

 

[mdogg]

Thanks Jordan and Jim! I didn't see those pics from the speed3 forums..... the muffler choice looks good and you are right! You definitely shouldn't be losing much in terms of power. I guess I read it quickly and only saw the outer design of the muffler. (my bad)

I actually already have the CPE catback with only the 14" muffler (and LOVE it!). I have the straight-pipe 3rd section hooked up now in case it gets too loud I can make it quieter if I needed to. I might need to do that swap once I install (if I ever receive) the SU test pipe. But if things ever get too loud after that, it's good to know there will be another good option from a trusted source!

 

[www.cp-e.com]

LOL, Jordan, are you reading my mind now? As soon as I clicked "submit" asking for pics, the are already there.... (thumb)

Jim

After we spoke on the phone I read mdogg post one more time and I understood what he was looking for (woops!). Thanks for posting pics from behind. I was curious if you could see the muffler from the rear too.

Thanks Jordan and Jim! I didn't see those pics from the speed3 forums..... the muffler choice looks good and you are right! You definitely shouldn't be losing much in terms of power. I guess I read it quickly and only saw the outer design of the muffler. (my bad)

I actually already have the CPE catback with only the 14" muffler (and LOVE it!). I have the straight-pipe 3rd section hooked up now in case it gets too loud I can make it quieter if I needed to. I might need to do that swap once I install (if I ever receive) the SU test pipe. But if things ever get too loud after that, it's good to know there will be another good option from a trusted source!

I'm so glad to hear that! Since Jim has been somewhat of an MS6 pioneer, we now know that we can incorporate this 12" oval muffler into our modular rear section. So if you do require a quieter muffler option once you install the test pipe, I think we should have what you need by then.

Thanks again Jim!! (headbang)


Jordan

 

[Klip]

Musom, will do and thanks.
Mustangman you too, appreciate both of you testing these options.

 

[mustangman]

I just bought some Dynamat Xtreme, and it will be delivered 4/16/07. My plan is to install it in the trunk first, and I'll do more DPs readings. If needed I will move on from there. I'll be sure to post again ASAP.

Also, if anyone is looking to buy that stuff, shoot me a PM for the place to get the best price.

Jim

 

[mustangman]

Dynamat installed in trunk:
Cabin @ Idle - 70
Cabin @ 40mph - 84
Cabin @ 70mph - 93
Cabin rev to 4,000 rpm - 89
Cabin hard accel 1-2nd gear - 100

These numbers are from Dynamat in the trunk floor only, I underestimated the time involved here and plan to do the rest possibly tomorrow. I will keep you posted.

Jim

CPE CAI - CPE Exhaust w/14" resonator & 12" Oval muffler - CPE DP w/Cat
Cabin @ Idle - 72
Cabin @ 40 MPH - 86
Cabin @ 70 MPH - 94
Outside Driver winder rev to 4,000 RPM - 95
Exhaust @ Idle - 98
Cabin Rev to 4,000 RPM - 90
Cabin @ Hard Accel - 1-2 Gear - 102

This 12" Oval helped a ton, drone is way down, and as is shows above DBs are down very close to stock. Under hard accel and spirited driving the exhaust note is still there, albeit less noise. I am very pleased with the results and plan to still do Dynamat/Shield to make the cabin very quiet, that will also be followed with DB levels.

I am attaching pictures of the system, this will show others the quality I always speak of when it comes to CPE... I mean, look at the welds, those alone are beautiful. Josh, Jordan, and Anthony... thank you guys for all your help and always taking the time to talk with me.

Jim

 

[MUSOM]

NICE. how long did it take you to do the trunk itself? got anything else installed?