Pros and cons of punching out the 3rd cat?

[TopherSho]

Has anyone removed JUST the 3rd cat exhaust impedance? 

What were the pro's / con's ?

Thanks in advance..

 

[lamrith]

Has anyone removed JUST the 3rd cat exhaust impedance? 

What were the pro's / con's ?

Thanks in advance..

I am guessing you mean the rear mufflers?  Far as I know the SHO only has a single pair of Cat's and are right at the turbos.  Then a muffler/resonator in the middle of car, then a pair of mufflers in the tail?  I replaced that last set with the Dynomax clamp on set and love the sound.  I also have PPE catted DP.

 

[polskifacet]

IMHO dont touch the stock exhaust and buy a catback. Keep it in storage for when you sell the car. You will want the full exhaust eventually.

 

[Gjkrisa]

I always was curious what third cat delete were talking about I've been under the car and can't see anything else that would look like a cat other then the ones just behind the turbos

Why do people say they have deleted 3rd cat?

Sent from my Nexus 6P using Tapatalk

 

[polskifacet]

I always was curious what third cat delete were talking about I've been under the car and can't see anything else that would look like a cat other then the ones just behind the turbos

Why do people say they have deleted 3rd cat?

Sent from my Nexus 6P using Tapatalk

Its directly behind the flex pipes.

 

[derfdog15]

There is a third cat which goes immeditly into the resonator after the townpipes come together. it is basically the merge. I left mine when I went to catless downpipes, and had a resonator delete and it didnt seem to be much of an issue.

 

[ZSHO]

Here's the stock OEM resonator and 3rd Cat for reference. Z

 

[TopherSho]

Seems most everyone just replaces the full exhaust,  hmm .

 

[lamrith]

Here's the stock OEM resonator and 3rd Cat for reference. Z

ohhh you mean the actual 3rd cat.    :doh:

Sorry I had in my mind "3rd set" so I was thinking the mufflers...  :bangin:

 

[CCXVI]

I removed the third cat and resonator before I did the cutouts.  It gave it a nice tone and I good cold start growl but no noise inside the cab.  I had an H pipe put in as well, since you lose all balancing if you don't.