hi flow cats

sbland26 · April 5th, 2009, 11:15 PM

So i think im going to go with the high flow cats instead of changing the midpipe. I was wondering if you guys reccomended any and if I were to do it would i just replace the 4 cats i have with the 2 high flows and connect the co2 sensor and thats it?

krazysnake · April 6th, 2009, 07:18 AM

I would just buy an aftermarket h pipe or x pipe with high flow cats with 2.5 piping and get rid of that restrictive factory piping

sbland26 · April 6th, 2009, 09:17 PM

ya i was thinkin about getting the offroad x with those hi flows but i dunno. still deciding, cause i want it loud but not to loud or my neighbors will kill me.

Fluffy The Rhino · April 6th, 2009, 09:34 PM

Do you have longtubes?

sbland26 · April 6th, 2009, 10:57 PM

no im keepign the headers stock y?

97mustanggt · April 7th, 2009, 12:27 AM

i thought about cutting out that four stock cats outta my stock h and put 2 hight flow ones...is that possible is it gonna pass smog like that?

sbland26 · April 7th, 2009, 09:17 AM

i was told it will, as long as you hook up the co2 sensor to it.

cobra99svt · April 7th, 2009, 09:58 AM

Your better off just getting a new H-pipe with hi-flow cats. Like a BBK or JBA.

Mustang RacR94 · April 7th, 2009, 12:12 PM

its 02 sensor btw not co2.

and even with two high flow cats instead of your stocker you may need the MIL eliminators, it might still throw a code for catalytic efficency.

ask someone who has done it for sure

Ive always like the SLP hi flow cats or Magnaflow high flow's.

97mustanggt · April 7th, 2009, 08:07 PM

i heard the pypes mini hight flow cats are good as well...but yeah has anybody done that cut out stockers and put high flows? anybody?

sbland26 · April 8th, 2009, 09:20 AM

anyone?

Mod mach · April 10th, 2009, 02:45 PM

what I was going to or should I say started doing was,cut the second cats off and add a stright pipe and keep the two first cats.the stock cats on 04's aren't that restrictive. It would prob be cheaper if you get an o/r and then add the hi flow cats to them.unless you can do the work yourself.

Mod mach · April 10th, 2009, 02:50 PM

I have the bassani cats and they work pretty good,as for passing smog in ca with only and hi flowing cats I don't know but if anyone has done it I would like to know too.

sbland26 · April 10th, 2009, 05:22 PM

yeah but the O2 (ya i got it right this time) sensors arent on the first 2 cats so to even try to be legal wont you have to get the high flows?

Mod mach · April 10th, 2009, 10:21 PM

yeah but if you keep the two first cats and remove the last two then you will have the first two cats befor the exhaust even gets to the o2 sensors,by then most of the fumes should be all burned up.

sbland26 · April 12th, 2009, 10:08 AM

yeah but is it still going to sound much better than stock...?

Mod mach · April 12th, 2009, 03:42 PM

it'll give you a lil different tone nothing crazy,on mine at idle or low rpm it's slightly louder almost stock sounding but once I get on it totaly different it roars like a beast.

sbland26 · April 12th, 2009, 07:24 PM

did u do the high flows with 2 stock cats?

ReverendDexter · April 12th, 2009, 07:36 PM

Originally Posted by 97mustanggt

i thought about cutting out that four stock cats outta my stock h and put 2 hight flow ones...is that possible is it gonna pass smog like that?

Nope. Especially now since they passed the recent restriction that mandates OBD II cats on ALL vehicles, not just those that came equipped with them.

"High-Flow" cats aren't smog legal, only factory cats are. For what it's worth, though, a brand-new OE cat flows every bit as well as a supposed "high flow" cat.

Mod mach · April 12th, 2009, 09:25 PM

[QUOTE=sbland26;1989999]did u do the high flows with 2 stock cats?[

yeah thats what i'm running but I guess its going todepend on the exhaust the your running too, That reason why I did this was cuz I busted one of the second cats damn speed bumps

April 5th, 2009, 11:15 PM	#1
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	hi flow cats So i think im going to go with the high flow cats instead of changing the midpipe. I was wondering if you guys reccomended any and if I were to do it would i just replace the 4 cats i have with the 2 high flows and connect the co2 sensor and thats it? __________________ 2004 Ford Mustang Mach 1

April 6th, 2009, 09:17 PM	#3
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	ya i was thinkin about getting the offroad x with those hi flows but i dunno. still deciding, cause i want it loud but not to loud or my neighbors will kill me. __________________ 2004 Ford Mustang Mach 1

April 6th, 2009, 09:34 PM	#4
Fluffy The Rhino Bearer of Bad News I has mustang and legacy. Slower than my Ruger. Join Date: Sep 2007 Location: The Fuckening Posts: 2,377 iTrader: 0 reviews	Do you have longtubes? __________________ ~MOD NUTSWINGER~ My Tongue Soothes Razorburn STOPSAYINGFAIL.COM EVERY FART IS A GAMBLE Just Think Of Me As A White Blood Cell.

April 6th, 2009, 10:57 PM	#5
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	no im keepign the headers stock y? __________________ 2004 Ford Mustang Mach 1

April 7th, 2009, 12:27 AM	#6
97mustanggt Hardcore Enthusiast 97GT & 97Snake & 00L T.B.A Join Date: Aug 2008 Location: Richgrove, Ca Posts: 2,183 iTrader: 0 reviews	i thought about cutting out that four stock cats outta my stock h and put 2 hight flow ones...is that possible is it gonna pass smog like that? __________________ 97 Cobra & 00 Lightning Beauty & The Beast I rev next to hybrids so they can hear me kill the environment MM Cobra Club Member #77 MM Lightning Club Founder

April 6th, 2009, 07:18 AM	#2
krazysnake Newbie 2004 cobra Join Date: Jan 2009 Location: bakersfield ca Posts: 9 iTrader: 0 reviews	I would just buy an aftermarket h pipe or x pipe with high flow cats with 2.5 piping and get rid of that restrictive factory piping

April 7th, 2009, 09:17 AM	#7
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	i was told it will, as long as you hook up the co2 sensor to it. __________________ 2004 Ford Mustang Mach 1

April 7th, 2009, 09:58 AM	#8
cobra99svt Regular 99 Cobra / 96 GT vert. N/A Join Date: Mar 2009 Location: Phoenix, AZ Posts: 159 iTrader: 0 reviews	Your better off just getting a new H-pipe with hi-flow cats. Like a BBK or JBA.

April 7th, 2009, 12:12 PM	#9
Mustang RacR94 MM Fanatic 99 cobra N/A Join Date: Dec 2006 Location: Fayetteville NC Posts: 3,169 iTrader: 0 reviews	its 02 sensor btw not co2. and even with two high flow cats instead of your stocker you may need the MIL eliminators, it might still throw a code for catalytic efficency. ask someone who has done it for sure Ive always like the SLP hi flow cats or Magnaflow high flow's. __________________ 99 Cobra 03 Cobra motor AFCO H/E Pulley JLT CAI BBK L/T off road H/steeda catback SCT MAF Tune 03 cobra pumps HVGC

April 7th, 2009, 08:07 PM	#10
97mustanggt Hardcore Enthusiast 97GT & 97Snake & 00L T.B.A Join Date: Aug 2008 Location: Richgrove, Ca Posts: 2,183 iTrader: 0 reviews	i heard the pypes mini hight flow cats are good as well...but yeah has anybody done that cut out stockers and put high flows? anybody? __________________ 97 Cobra & 00 Lightning Beauty & The Beast I rev next to hybrids so they can hear me kill the environment MM Cobra Club Member #77 MM Lightning Club Founder

April 8th, 2009, 09:20 AM	#11
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	anyone? __________________ 2004 Ford Mustang Mach 1

April 10th, 2009, 02:45 PM	#12
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	what I was going to or should I say started doing was,cut the second cats off and add a stright pipe and keep the two first cats.the stock cats on 04's aren't that restrictive. It would prob be cheaper if you get an o/r and then add the hi flow cats to them.unless you can do the work yourself. __________________ 4Cams,4Valves,4.10's Hell yeah

April 10th, 2009, 02:50 PM	#13
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	I have the bassani cats and they work pretty good,as for passing smog in ca with only and hi flowing cats I don't know but if anyone has done it I would like to know too. __________________ 4Cams,4Valves,4.10's Hell yeah

April 10th, 2009, 05:22 PM	#14
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	yeah but the O2 (ya i got it right this time) sensors arent on the first 2 cats so to even try to be legal wont you have to get the high flows? __________________ 2004 Ford Mustang Mach 1

April 10th, 2009, 10:21 PM	#15
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	yeah but if you keep the two first cats and remove the last two then you will have the first two cats befor the exhaust even gets to the o2 sensors,by then most of the fumes should be all burned up. __________________ 4Cams,4Valves,4.10's Hell yeah

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April 12th, 2009, 10:08 AM	#16
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	yeah but is it still going to sound much better than stock...? __________________ 2004 Ford Mustang Mach 1

April 12th, 2009, 03:42 PM	#17
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	it'll give you a lil different tone nothing crazy,on mine at idle or low rpm it's slightly louder almost stock sounding but once I get on it totaly different it roars like a beast. __________________ 4Cams,4Valves,4.10's Hell yeah

April 12th, 2009, 07:24 PM	#18
sbland26 Regular 2004 Mustang Mach 1 Join Date: Mar 2007 Location: Maryville, Illinois Posts: 199 iTrader: 0 reviews	did u do the high flows with 2 stock cats? __________________ 2004 Ford Mustang Mach 1

April 12th, 2009, 09:25 PM	#20
Mod mach Regular Join Date: Aug 2008 Posts: 126 iTrader: 0 reviews	[QUOTE=sbland26;1989999]did u do the high flows with 2 stock cats?[ yeah thats what i'm running but I guess its going todepend on the exhaust the your running too, That reason why I did this was cuz I busted one of the second cats damn speed bumps __________________ 4Cams,4Valves,4.10's Hell yeah

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