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I am heading to the exhaust shop for some further modifications to my system. I have the back boxes off now, and find it a little too loud at idle. So I am considering a process like this, if anyone thinks there is a better way of going about this, please do let me know as I am no expert:

1. Baseline Dyno
2. Remove center resonator
3. 2nd Dyno run
4. If the second run is higher, keep center resonator off and add round body magnaflows in place of the resonator. (I'm sure pure straight pipes will be much too loud, and am hoping the magnaflows will make things slightly quieter than the stock resonator.) If this isn't the case, I suppose I will need to chop into the straight pipes where the back boxes were, as this is the only place with room to add something else.
5. If the second dyno run is lower than the base line, then I will try to add smaller magnaflows just after the resonator where the double bends in the pipes are now.

My thinking on this sequence is that from some reading, it seems that the center resonator on cars is designed with sufficient volume to make the cat back portion of the exhaust to appear to be an open system to the engine, so I am unclear whether removing it may have adverse effects rather than positive ones on exhaust performance.

Question is, does the computer adjust instantly to the different flow characteristics of removing the resonator, etc. (Will the second dyno run show a valid difference in its results, or does it take the computer time to recalibrate?)
 

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I am heading to the exhaust shop for some further modifications to my system. I have the back boxes off now, and find it a little too loud at idle. So I am considering a process like this, if anyone thinks there is a better way of going about this, please do let me know as I am no expert:

1. Baseline Dyno
2. Remove center resonator
3. 2nd Dyno run
4. If the second run is higher, keep center resonator off and add round body magnaflows in place of the resonator. (I'm sure pure straight pipes will be much too loud, and am hoping the magnaflows will make things slightly quieter than the stock resonator.) If this isn't the case, I suppose I will need to chop into the straight pipes where the back boxes were, as this is the only place with room to add something else.
5. If the second dyno run is lower than the base line, then I will try to add smaller magnaflows just after the resonator where the double bends in the pipes are now.

My thinking on this sequence is that from some reading, it seems that the center resonator on cars is designed with sufficient volume to make the cat back portion of the exhaust to appear to be an open system to the engine, so I am unclear whether removing it may have adverse effects rather than positive ones on exhaust performance.

Question is, does the computer adjust instantly to the different flow characteristics of removing the resonator, etc. (Will the second dyno run show a valid difference in its results, or does it take the computer time to recalibrate?)
The only mod I have done is to remove the "central silencer" as Maserati calls it. The hope was to add a little more volume to the exhaust note. It may have but I'm unclear on whether it made a power difference. Looking inside the Central Silencer it's clear it's a straight-through resonator going through a perferated tube. No direct baffeling (looks like a glass pack). I left the X-Pipe and rear boxes in place. I may put the Central Silencer back in since I didn't notice much of a change and go with rear muffler replacements.

The computer automatically adjusts for changes and doesen't throw a CEL.

Buzz
 

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X-OST System

Hey Guys,

I just installed a new X-OST system: 4.2 GT rear silencer and central pipes (replacing the central silencer) to my 2002 Spyder and sounds great. Also, I can feel the difference in power and acceleration. Can't wait to dyno the car to see the results. Here are some pics and link to the sound. Hope you like it.

http://media.putfile.com/2002MaseratiSpyderXOST
 

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great photos

thanks for clear/great photos of the project. What's the consensus of the group: this set up vs. tubi exhaust. I believe the tubi's only include the rear most set of mufflers and there is some disagreement whether or not they increase HP, but many people here say they sound fantastic and that's half the fun. Did you system cost more or less than the tubi system? Thanks!
 

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I went with the Quicksilver Sport setup for my 05 CC and I love it...the sound is great and there is a noticable increase in acceleration...I am planning on removing the entire emissions system and having a set of custom headers fabbed up by Quicksilver this coming winter.
 

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Im running the stock front resonator with just baffled tail pipes on mine (no rear boxes).

Not too loud but it sounds absolutely epic.:D
 

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thanks for clear/great photos of the project. What's the consensus of the group: this set up vs. tubi exhaust. I believe the tubi's only include the rear most set of mufflers and there is some disagreement whether or not they increase HP, but many people here say they sound fantastic and that's half the fun. Did you system cost more or less than the tubi system? Thanks!
The price was much lower than Tubi. And you can definitely notice an improvement in acceleration.

We have installed and had Tubi exhaust before on other cars, and at low rpm's the sound becomes annoying, reason I opted for X-OST. But again, it is all about taste.

PM me if you want more details.
 

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