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      03-28-2012, 07:14 PM   #1
Pak317
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Completely Catless w/Stock Muffler?

I currently have a Fabspeed HFC + X-pipe setup up and was just curious if anyone has tried a completely catless (No primary + Secondary cats) setup with the stock muffler?

Would there even be any significant gains over my HFC + Xpipe setup?

Getting bored with my current setup....

Any info would be appreciated!
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      03-28-2012, 07:32 PM   #2
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I'm about to do this, but judging by the few vids i found it kinda sounds funky. kinda raspy but not nice e46m raspy. what do you plan to use for cel? tune or akra delete-r?
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      03-28-2012, 08:53 PM   #3
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^Yea...what he asked. How would you accomodate for the CEL and OBD readiness?
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      03-28-2012, 10:01 PM   #4
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No cats whatsoever with the stock exhaust... I tried it and it was horrible. It sounded like the muffler was blown out. So much rasp and so unrefined that I couldn't take off from a light without feeling like tasteless moron, bastardizing a classy sports car. I had to shift around 2k just to avoid the obnoxious farty sound that kicks in at 2k.
From outside it didn't sound as bad as it did inside. Inside all I could here was rasp as if the exhaust had no bass or mids.
I was told some people like the sound so you have to try it. Here are my videos. I could not WOT because it would have been too loud and everyone would know it was me.

http://www.youtube.com/watch?v=K460ebaSSS8&feature=youtube_gdata_player

http://www.youtube.com/watch?v=JjvzmmsLLSg&feature=youtube_gdata_player
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      03-28-2012, 10:37 PM   #5
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CEL def. sounds like shit IMO
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      03-28-2012, 10:39 PM   #6
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Quote:
Originally Posted by Pak317 View Post
I currently have a Fabspeed HFC + X-pipe setup up and was just curious if anyone has tried a completely catless (No primary + Secondary cats) setup with the stock muffler?

Would there even be any significant gains over my HFC + Xpipe setup?

Getting bored with my current setup....

Any info would be appreciated!
Very little difference per the testing that Evolve did on their exhaust. They released all the data, just do a search. They have graphs showing 200CPI cats vs. none...

Also - it will sound farty with the stock muffler...
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      03-28-2012, 10:42 PM   #7
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As a general rule running catless with stock mufflers sounds terrible..been there
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      03-28-2012, 11:08 PM   #8
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Quote:
Originally Posted by tibra1 View Post
As a general rule running catless with stock mufflers sounds terrible..been there
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      03-28-2012, 11:10 PM   #9
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      03-28-2012, 11:36 PM   #10
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      03-29-2012, 06:35 AM   #11
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If you run 4 resonators, it sounds fine.

As for significant gains from ditching high flow cats for no cats, I would have to study the dynos. If no cats is worth about 20-25 rwhp, I'll guesstimate that high flow cats drop the gains to 15-20 rwhp.
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      03-29-2012, 07:02 AM   #12
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Quote:
Originally Posted by tibra1 View Post
As a general rule running catless with stock mufflers sounds terrible..been there
General Rule....yes.

BUT...I heard testpipes on a ACM oem modded exhaust and it sounded EPIC.
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      03-29-2012, 09:55 AM   #13
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Thanks for the replies guys!

As far as the CEL, I'll just buy a tune or try spacers first.

Installing some resonators was an idea that crossed my mind but I think I will go ahead with it and see where it goes. But, if I were to install resonators, will placement of said resonators affect drone/sound?

As far as exhaust, if the OE sounds like shiet, I could always put the AP exhaust back on or just go back to my fabspeed system
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      03-29-2012, 09:58 AM   #14
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Quote:
Originally Posted by Singletrack View Post
Very little difference per the testing that Evolve did on their exhaust. They released all the data, just do a search. They have graphs showing 200CPI cats vs. none...

Also - it will sound farty with the stock muffler...
Thanks, i'll have to search for their data
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      03-29-2012, 12:01 PM   #15
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Worst sound out there unless you are quad resonated
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      03-29-2012, 04:51 PM   #16
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Quote:
Originally Posted by GreeKon View Post
General Rule....yes.

BUT...I heard testpipes on a ACM oem modded exhaust and it sounded EPIC.
Ahh!..But that is not a stock muffler..thats in essence a straight pipe setup
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      03-29-2012, 05:52 PM   #17
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Quote:
Originally Posted by Raptor251 View Post
Worst sound out there unless you are quad resonated
I'll just have to try it in steps! I plan on leaving the oe resonators on and then go from there.
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      03-30-2012, 02:24 AM   #18
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I tried it and it was horrible. It sounded like the muffler was blown out.
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