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kul997
Newbie


Joined: 06 May 2019
Posts: 16



PostPosted: Wed Jul 10, 2019 10:27 am    Post subject: 997 Targa 4S X51 - New Exhaust system or Not Reply with quote

Hi all,
I'm considering getting an upgrade as the exhaust is showing it's age and when it's back from Hartech I figured this would be the best time to upgrade it as the bolts should be easy to remove after having the engine rebuilt.
I'm deliberating if the added expense of a new system would improve the performance, as it already has a PSE.
Also, i'm not sure what type of Cats I have fitted, standard, 200 or 100. Any info would be appreciated.
Cheers,
K.
 
  
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Thefinn
Suzuka


Joined: 11 Jun 2014
Posts: 1112
Location: Essex


PostPosted: Thu Jul 11, 2019 7:31 pm    Post subject: Reply with quote

As your car is an X51 it has different larger bore headers anyway to the stand ones so you might want to keep them as these sound deeper with more growl and should flow better, but upgrading the bolts at this point would be a good idea. If the CATS are standard then you might want to get some 200 cell ones as this will free up some power, 100 cel apparently can quite often throw codes. You can save weight by changing the mufflers but you will need a switchable sytem unless you dont mind losing this option.

Personally if the system is ok I would just change the CATS as this will give a noticeable gain and leave the rest as is but I might be biased as I have the same system as you but with top gear 200 cel CATS.
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CarreraMonkey
Watkins Glen


Joined: 02 Sep 2013
Posts: 2017
Location: Silverstone (ish)

2007 Porsche 997 Carrera 4S

PostPosted: Thu Jul 11, 2019 7:32 pm    Post subject: Reply with quote

My pse silencers were toast and there was no way I was ***** out for a pair of oem items at £3k.

So I bought a pair of topgear valvetronic items. Cheap and work fine with the sport button.

I've got 200 cell cats on mine too and its loud when the valves are open, but I love it.

Be aware, the oem pse tailpipes wont fit and you'll need to buy some standard firming items (1 pipe in, rather than 2).
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tuscanracer
Newbie


Joined: 07 Jul 2019
Posts: 19



PostPosted: Fri Jul 19, 2019 3:39 pm    Post subject: Reply with quote

Thefinn wrote:
As your car is an X51 it has different larger bore headers anyway to the stand ones so you might want to keep them as these sound deeper with more growl and should flow better, but upgrading the bolts at this point would be a good idea. If the CATS are standard then you might want to get some 200 cell ones as this will free up some power, 100 cel apparently can quite often throw codes. You can save weight by changing the mufflers but you will need a switchable sytem unless you dont mind losing this option.

Personally if the system is ok I would just change the CATS as this will give a noticeable gain and leave the rest as is but I might be biased as I have the same system as you but with top gear 200 cel CATS.


Was there a noticeable change in the exhaust tone just from changing the cats?
 
  
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CarreraMonkey
Watkins Glen


Joined: 02 Sep 2013
Posts: 2017
Location: Silverstone (ish)

2007 Porsche 997 Carrera 4S

PostPosted: Sat Jul 20, 2019 8:57 am    Post subject: Reply with quote

Yep 200 cell cats alone made it louder on mine. But the oem pse silencers eventually had to be swapped as they were shagged. The topgear units, with 200 cell cats on the x51 exhaust headers just howl.

Maybe too much for some, but I love it.

I should probably add that mines a factory x51 car too..
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Thefinn
Suzuka


Joined: 11 Jun 2014
Posts: 1112
Location: Essex


PostPosted: Sun Jul 21, 2019 6:14 pm    Post subject: Reply with quote

Changing just the cats will alter the sound but not as much as the headers as well. You can get different sounds from the cats choosing between cross over vs x pipe and the bore as well will make a difference.
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