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What is diameter of these systems, is terry griffin selling these at his shop in CA
2.75" I believe.
That's what my DP is

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Hey Colin are you running a Milltek DP with stock exhaust? Some are saying it's not compatible with stock cat back.


Tappin on the phone
 

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Hey Colin are you running a Milltek DP with stock exhaust? Some are saying it's not compatible with stock cat back.


Tappin on the phone
I am indeed. I'm changing that today though.
I can see what they are saying, I do have a decent exhaust leak because the Milltek is so much bigger than the stock flange.

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I am indeed. I'm changing that today though.
I can see what they are saying, I do have a decent exhaust leak because the Milltek is so much bigger than the stock flange.

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Hmmm. That's not what Milltek says. In a private note question, I got this answer:

MilltekSportUSA said:
The system is flanged where it connects to the down pipe. The flanges are the same size.
I'm a little worried about this issue, although I have had mismatched openings (but matching flange outer diameter and connections) in the past with no apparent issues (at least that I noticed).

Edit: Now that I think of it though, Milltek's response was to a question regarding the stock cat with their catback exhaust, so might not really apply. Just a clarification...
 

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The flanges are 100% not the same size. The stock one is much smaller.



 
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