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Old 02-20-2008, 09:26 PM
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Secondary Cats and other Exhaust Questions

I have an '07 CS with a Milltek cat back, GIAC flash and EVO intake. Power increase is substantial, but exhaust sound leaves something to be desired - not a big change from stock. Significant other has just bought an '08 base Boxster. Exhaust sound is terrific, great growl, totally different from my stock system (I believe), certainly much better than my Milltek, about which I am constantly reminded. So, given all of that, I have a few questions I would like answers to help both the car and my ego.

Is the Cayman and Boxster exhaust the same? I assume so, but don't really know.

If so, are the '08 and '07 exhausts the same?

Here's the biggie. If I took out the secondary cats (replaced with straight pipes), would air flow increase through the system to the level achieved by the Milltek?

Thanks.

Last edited by thomgay; 02-20-2008 at 10:42 PM.
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Old 02-20-2008, 09:44 PM
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I think so, but I remember somebody also did this to the Miltek although not cats they are still cans and it made quite a difference to the sound...
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Old 02-20-2008, 09:57 PM
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Originally Posted by thomgay View Post
I have an '07 CS with a Milltek cat back, GIAC flash and EVO intake. Power increase is substantial, but exhaust sound leaves something to be desired - not a big change from stock. Significant other has just bought an '08 base Boxster. Exhaust sound is terrific, great growl, totally different from my stock system (I believe), certainly much better than my Milltek, about which I am constantly reminded. So, given all of that, I have a few questions I would like answers to help both the car and my ego.

Is the Cayman and Boxster exhaust the same? I assume so, but don't really know.

If so, are the '08 and '07 exhausts the same?

Here's the biggie. If I took out the secondary cats (replaced with straight pipes), would air flow through the system increase to the level achieved by the Milltek?

Thanks.
Go with Tubi and you will definitely be louder than the Boxster
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Old 02-21-2008, 12:25 AM
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Originally Posted by thomgay View Post
Is the Cayman and Boxster exhaust the same? I assume so, but don't really know.

If so, are the '08 and '07 exhausts the same?

Here's the biggie. If I took out the secondary cats (replaced with straight pipes), would air flow increase through the system to the level achieved by the Milltek?

Thanks.
Yes the Cayman and boxster exhaust are the same for the 3.4L engines.
The tips are different as well as the T-pipe that connects to the tip and mufflers.
You would have to chop up the mufflers to remove the secondary cats (that is what the sport exhaust does, bypasses the second cats) it will sound like the sport exhaust with valves open.
It would not be louder than milltek, but sound alot like it.
I went from the full Milltek exhaust to the full APR and am very satisfied with the sound as well as quality. It also added 4WHP and 5FTLBS more than Milltek.
Here are sound clips as well as dynos in this thread:
APR Full exhaust installed!
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Old 02-22-2008, 01:08 AM
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I chopped off the secondary mufflers from my Milltek system and LOVE the sound. I found it way too quiet before.
Here is the thread that i posted:
Milltek Catback mod?
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