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CEG\'er
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By Mystery mod i presume you mean gutted precats?? How did you find this??More power??Better pick up?? Or not worth it?? I'm looking at doing it more to avoid plugging of the cats later on in life but as they are new (2k miles old) i suppose it's more down to performance at the moment!! Lsst thing i want is power loss from gutted precats.......
Mondeo V6 RS
RS Bodykit
RS Lowered
SVT UIM
SVT TB
SVT LIM
Philips 6000K HID ZENON
Twin Stainless Exhaust
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Hard-core CEG'er
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I was beginning to get symptoms of plugged pre-cats (sluggish acceleration, reluctance to redline, etc.), so I did the mod. The car performs about like it did when I first bought it.  Love it. If your choice is gutting VS spend money for new - it's worth it. If you want gains - get the MSDS headers. WAAAY cheaper than new pre-cats. My suggestion to you (assuming you have plugged pre-cats): Gut the precats - see if you pass inspection - check out the docile sound. If you want to go for added performance later - get the MSDS, mod your stock Y & sell the MSDS Y to gain back some of your investment. With the gutted pre-cats I do not notice any gains vs my car when I bought it, just a slight extra drone from the exhaust. I also do not have headers, and the car is quiet as stock with the Dynomax Super Turbo muffler at the rear & a straight through resonator in the mid section. I'm gonna have the setup reversed - with an Ultraflow at the front. The shop screwed up my order & got me a turbo muffler instead of straight through. I had wanted to get a straight through Magnaflow setup from Stazi, but my resonator got crushed & ripped open by some debris on the interstate one afternoon, so I couldn't wait for shipping. Sorry Stazi.  (I have also found out that my drivers side tranny/axel seal is leaking from that impact  )
Must be that jumbly-wumbly thing happening again.
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Joined: Aug 2002
Posts: 339
CEG\'er
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OP
CEG\'er
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Just the kind on answer i was after! Thanks, I have a spare set of pre cats so i was toying with gutting them and sticking them on,as it stands i think i'll just go for the Y pipe and cat from BAT.......
Mondeo V6 RS
RS Bodykit
RS Lowered
SVT UIM
SVT TB
SVT LIM
Philips 6000K HID ZENON
Twin Stainless Exhaust
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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Hard-core CEG'er
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It is not noisy with gutted pre-cats!
It actually sounds better with the pre-cats gutted, and the main cat DOES keep things quieter. No resonator will result in lots of drone.
MSDS headers, open free flowing cat and a muffler in the stock resonator location will sound very good. THe power will also be worth it.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Mar 2003
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Originally posted by warmonger:
It is not noisy with gutted pre-cats!
MSDS headers, open free flowing cat and a muffler in the stock resonator location will sound very good. THe power will also be worth it.
Originally posted by TourDeForce:
With the gutted pre-cats I do not notice any gains vs my car when I bought it, just a slight extra drone from the exhaust. I also do not have headers, and the car is quiet as stock with the Dynomax Super Turbo muffler at the rear & a straight through resonator in the mid section.
That's what I said... 
Must be that jumbly-wumbly thing happening again.
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Joined: Aug 2001
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Originally posted by TourDeForce:
Originally posted by warmonger:
It is not noisy with gutted pre-cats!
MSDS headers, open free flowing cat and a muffler in the stock resonator location will sound very good. THe power will also be worth it.
Originally posted by TourDeForce:
With the gutted pre-cats I do not notice any gains vs my car when I bought it, just a slight extra drone from the exhaust. I also do not have headers, and the car is quiet as stock with the Dynomax Super Turbo muffler at the rear & a straight through resonator in the mid section.
That's what I said...
Last I heard, Drone was a type of noise.
Therefore, saying " gutted precats aren't noisy" and " I
have just a slight extra drone..." Doesn't seem to go together to me.
Also, to further empahsize my point as to why I WANTED to clarify that:
I deem "noisy" things to be items that are audible, but NOT pleasureable to listen to.
e.g. a rumbling v8 exhaust sounds good, a farty-sounding honda with drone and rasp sounds "NOISY" even when the v8 might technically be louder.
THEREFORE: Drone is not desired, does not sound good and is therefore "Noisy" to me and probably most people.
Since this is such a subjective topic, I felt that your statements were in direct contradiction to each other.....and felt the need to 'add to it'.
I haven't heard one SVT with gutted precats increasing in drone as long as a resonator is retained. They sound a bit more rumbly, not really louder but just a tone change to the exhaust, and they sound pretty good overall I must say.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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I didnt notice any drone or rasp when I gutted mine. In fact, I prefer the gutted sound.
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Joined: Mar 2003
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Hard-core CEG'er
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Originally posted by warmonger:
Originally posted by TourDeForce:
With the gutted pre-cats I do not notice any gains vs my car when I bought it, just a slight extra drone from the exhaust. I also do not have headers, and the car is quiet as stock with the Dynomax Super Turbo muffler at the rear & a straight through resonator in the mid section.
Originally posted by TourDeForce:
That's what I said...
Last I heard, Drone was a type of noise.
Therefore, saying " gutted precats aren't noisy" and " I
have just a slight extra drone..." Doesn't seem to go together to me.
Also, to further empahsize my point as to why I WANTED to clarify that:
I deem "noisy" things to be items that are audible, but NOT pleasureable to listen to.
e.g. a rumbling v8 exhaust sounds good, a farty-sounding honda with drone and rasp sounds "NOISY" even when the v8 might technically be louder.
THEREFORE: Drone is not desired, does not sound good and is therefore "Noisy" to me and probably most people.
Since this is such a subjective topic, I felt that your statements were in direct contradiction to each other.....and felt the need to 'add to it'.
I haven't heard one SVT with gutted precats increasing in drone as long as a resonator is retained. They sound a bit more rumbly, not really louder but just a tone change to the exhaust, and they sound pretty good overall I must say.
Right. I was thinking he meant volume, when he may have actually meant "noise" by your definition - which, strictly speaking, I consider correct.
As a parent of two, noise has evolved to mean something (noise or not) of significant enough volume so as to alter my mood  - or at least irritate my typically placid demeaner. 
Your clarification was a valid & justified point. Thank you. 
Must be that jumbly-wumbly thing happening again.
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