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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

catalytic converter on 96-98 GT's

  • Thread starter Thread starter Twista
  • Start date Start date Sep 1, 2006

Twista

Active Member
May 7, 2004
510
2
29
@ the z00 in chicago
Sep 1, 2006
#1
  • Sep 1, 2006
  • #1
How many catalytic converters are on theses cars? Is it 4 or 6? I looked under my car and i got the 4 normal looking ones than i have two that stand up and connect to the headers. Now why the heck are the early 4.6 quieter than the late 99+ 4.6's?? Does thoses 2 extra things (some called them a resonator and some say there cats) actually quiet down the 96-98 even more than the newer 4.6 GT's???

Exactly how it looks? The 2 things standing up LOOKs like another set of catalytic converter. Midpipe from a 96-98 gt
View attachment 443480
View attachment 443482

and so people doesnt think im crazy.. HERES A STOCK MIDPIPE FROM A 01 STANG GT!
View attachment 443484

this is why i think the 99+ gt's are way louder with a aftermarket catback than a 96-98 gt with a aftermarket catback.

and for the hell of it:
a stock hpipe from a 87-93 GT
View attachment 443486


WHY DID FORD PUNISH US EARLY 4.6 OWNERS WITH A NONPI INTAKE AND CRAPPY QUIET HPIPE!


Now if one was to get a catted midpipe they would only have 2 cats and no resonators.

If one was to remove (GULT if possbile) the resonators (EXTRA 2 cats) how would that effect the sound of the car? Im wondering if removed two cats and replaced them with piping would my GT sound closer to a 99+ gt with the same catback. Because right now my GT is quiet as hell compared to my friends with the same exhaust but 99+.
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Sep 1, 2006
#2
  • Sep 1, 2006
  • #2
mines got the same thing going on (96) im pretty sure its a resonator being that it should only have 4 cats. Kinda wondered too myself tho
 

Twista

Active Member
May 7, 2004
510
2
29
@ the z00 in chicago
Sep 1, 2006
#3
  • Sep 1, 2006
  • #3
CobraRed_96_GT said:
mines got the same thing going on (96) im pretty sure its a resonator being that it should only have 4 cats. Kinda wondered too myself tho
Click to expand...


well, it may be that, but why does the older midpipe and the newer 01 midpipe NOT have thoses 2 things. I can clearly count 4 things on the old and newer midpipe, but on the middle year midpipe 96-98 i can count 6 things
wish i knew.
Soon as i get some money i can stop wondering and have fun with my catted x ;]
 

96BlueStangGT

Member
Jul 7, 2004
38
0
16
Southern Indiana
Sep 1, 2006
#4
  • Sep 1, 2006
  • #4
Four converters, two resonators. I don't know why they changed the midpipes around, but I think the PI heads have something to do with the sound too.
 

DropTopPony

Noob Slayer
Founding Member
Aug 13, 2002
2,570
3
48
south jersey
Sep 1, 2006
#5
  • Sep 1, 2006
  • #5
6 whatever they were in the scrap pyle manny years ago....bassani cat X put a smile on my face.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,252
17,937
224
Massachusetts
Sep 2, 2006
#6
  • Sep 2, 2006
  • #6
96-98 4.6's have a 6-cat H-pipe.

With the 99-04 Mustang, Ford got it to run cleaner and used better quality cats so it only needed 4. Some early 99 GT's did come with leftover 6-cat pipes though.

The sound difference is due to many other things, including different mufflers, different heads, different cam profiles and more HP
 

fastangboi

My first set of nuts vibrated themselves off.
Jul 26, 2006
274
0
0
Slowville
Sep 2, 2006
#7
  • Sep 2, 2006
  • #7
6 cats on the 96-98 GTs and yes that makes it quieter. An old friend of mine had a 98 gt and he just took off the whole cat back system and it was still tollerable. I did that in my driveway with my 2000 and it was way too loud.
 

CanadaStang

New Member
Sep 7, 2003
2,093
1
0
Mb
Sep 2, 2006
#8
  • Sep 2, 2006
  • #8
Mustang5L5 said:
96-98 4.6's have a 6-cat H-pipe.

With the 99-04 Mustang, Ford got it to run cleaner and used better quality cats so it only needed 4. Some early 99 GT's did come with leftover 6-cat pipes though.

The sound difference is due to many other things, including different mufflers, different heads, different cam profiles and more HP
Click to expand...

+1
 

Dope 97GT

New Member
Jul 16, 2005
439
0
0
Rochester, NY (SUNY Brockport)
Sep 3, 2006
#9
  • Sep 3, 2006
  • #9
6 cats for sure I have mine in my garage.
 
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