Cut-In Cat Kit?

May 6th, 2008, 06:25 PM	#1
KenDogg Regular Join Date: Aug 2007 Posts: 366	Cut-In Cat Kit? Hey guys, I am finally about to buy an exhaust system for the stang. I want to get the mac LT's with prochamber mid and the FRPP stinger axle backs. The problem is i need cats because i have to pass emissions testing. I phoned brenspeed to see if another type of catted mid-pipe would fit, spoke to Seth there and he says i can buy a cut-in cat kit that i can cut into the shorty o/r prochamber to make it pass emissions. Has anyone ever used something like this or heard of it being used? If so, are they any good and will i need to buy anything along with it? Thanks __________________ '07 GT Alloy, 5 speed; JLT, Livewire, MGW

May 6th, 2008, 06:38 PM	#2
02StangGToWNEr Hardcore Enthusiast 2006 Mustang GT Join Date: Feb 2007 Location: Upstate NY Posts: 2,667	PM 07stanggt, because he can get you the Prochamber that bolts after your stock cats. And I think it can be used with LT's, but ask him to be sure.

May 6th, 2008, 06:48 PM	#3
GTron Regular Alloy 2007 Mustang GT 13.39@103.49 Join Date: Dec 2005 Location: Fairfield, TX Posts: 209	If it bolts to the stock cats, it won't be able to be used with LTs __________________ Alloy 07 GT Hurst Shifter C&L Racer Intake w/Breenspeed Tune Eibach Pro Kit Pypes Mid-Muffler System 4.10s (Waiting to be installed) Current Best Time: 13.39 @ 103.49 (With Intake, tune, and shifter only at the time) Hurst crew member #8

May 6th, 2008, 07:00 PM	#4
KenDogg Regular Join Date: Aug 2007 Posts: 366	i've been pm'ing with 07stanggt trying to find a solution. i didn't think the bolt to factory cats prochamber would work with LT's but that would be awesome if it does. i'll try calling mac direct if anyone is going to know it's them. __________________ '07 GT Alloy, 5 speed; JLT, Livewire, MGW

May 6th, 2008, 07:06 PM

GTron

Regular

Alloy 2007 Mustang GT

13.39@103.49

Join Date: Dec 2005

Location: Fairfield, TX

Posts: 209

Originally Posted by KenDogg

i've been pm'ing with 07stanggt trying to find a solution. i didn't think the bolt to factory cats prochamber would work with LT's but that would be awesome if it does. i'll try calling mac direct if anyone is going to know it's them.

I'll guarantee that it won't work and even if it did, then you're defeating the purpose of the LTs because of the restriction of the stock cats.

Don't know of any solutions off the top of my head, but I'll look some more tonight.

__________________

Alloy 07 GT
Hurst Shifter
C&L Racer Intake w/Breenspeed Tune
Eibach Pro Kit
Pypes Mid-Muffler System
4.10s (Waiting to be installed)

Current Best Time: 13.39 @ 103.49 (With Intake, tune, and shifter only at the time)
Hurst crew member #8

May 6th, 2008, 07:08 PM	#6
06RedfireGT Captain Of Team Leg Hump 2006 Mustang GT In the 13's Join Date: Aug 2006 Location: I'm so badass I make medicine cry Posts: 10,126	You can just buy some universal cats and have an exhaust shop weld them in. __________________ Bassani Crew Member #1 Better to be judged by 12 then carried by six.

May 6th, 2008, 07:26 PM	#7
KenDogg Regular Join Date: Aug 2007 Posts: 366	thanks GTron and 06Red. i found this kit off Jeg's after you linked me there PYPES CVM10K - PYPES Catalytic Converters - JEGS does anyone know how well this will fit/work if i cut it into the prochamber? Also, will i need to weld in bungs for 02 sensors or something or will they come on the headers/mid pipe/cats whichever? __________________ '07 GT Alloy, 5 speed; JLT, Livewire, MGW

May 6th, 2008, 09:17 PM	#8
GTron Regular Alloy 2007 Mustang GT 13.39@103.49 Join Date: Dec 2005 Location: Fairfield, TX Posts: 209	By looking at the cats you posted and the prochamber for the LTs, I really doubt there will be room to put the cats. Says the ones you posted are 11" long, so you would need a section of the mid pipe that is good and straight for longer than that. __________________ Alloy 07 GT Hurst Shifter C&L Racer Intake w/Breenspeed Tune Eibach Pro Kit Pypes Mid-Muffler System 4.10s (Waiting to be installed) Current Best Time: 13.39 @ 103.49 (With Intake, tune, and shifter only at the time) Hurst crew member #8

May 6th, 2008, 11:37 PM	#9
06RedfireGT Captain Of Team Leg Hump 2006 Mustang GT In the 13's Join Date: Aug 2006 Location: I'm so badass I make medicine cry Posts: 10,126	I wonder if you could mount the cats after the crossover? __________________ Bassani Crew Member #1 Better to be judged by 12 then carried by six.

May 6th, 2008, 11:58 PM	#10
PiggySmallz Enthusiast 2007 Mustang GT Join Date: Feb 2007 Location: Brooklyn, NY Posts: 843	you are in luck man. Someone just did this on mustangforums...him and I spoke a lot about doing it. I want hearders soon but I may ditch the prochamber. I get that annoying sound of air going through it and it sounds like a leak. It drives me nuts. Also I have a leak I cant get rid of no matter what I do....sorry for the tangent here is the link: Prochamber, Stingers, Pypes cats.....INSTALLED __________________

May 7th, 2008, 09:20 PM	#11
KenDogg Regular Join Date: Aug 2007 Posts: 366	thanks Piggy. this guy did it on a full length prochamber though, i would have to do it on a shorty prochamber to meet the longtubes, do you think it would fit? also, you mentioned an air noise through the prochamber, is it really annoying? where/when do you hear it? if it's bad maybe i should stay away from the mac setup __________________ '07 GT Alloy, 5 speed; JLT, Livewire, MGW

May 7th, 2008, 11:12 PM

#12

2BStang

Newbie

Join Date: May 2008

Posts: 13

Originally Posted by 06RedfireGT

I wonder if you could mount the cats after the crossover?

I doubt it would have the exaust heat needed to make the cat's work... Not too sure on that though..

May 7th, 2008, 11:48 PM

#13

07stanggt

Authorized Vendor

2007 GT

12.40@114.55

Join Date: Mar 2007

Location: Ellicott City, MD

Posts: 6,259

Originally Posted by GTron

If it bolts to the stock cats, it won't be able to be used with LTs

There is only one prochamber, you can get it three ways, First, with legs that run all the way to the stock manifold or shorty headers, Second, with shorter legs that run to the long tubes, or you can just buy the prochamber itself and splice it in. You would do this in the same way you would do a splice in xpipe, you cut behind the H crossover and bolt the prochamber on.

So, you have a couple of options; Buy the prochamber by itslef and find some catted legs and make them fit to the mac lts. Or you could buy the legs that go to the lt's and cut and weld in your stock cats, or aftermarket cats.

Mac had a catted system for the long tubes until 2005, catco made the cats, they stoped providing warranties for the cats and Mac stop buying them. So it can be done, its in essence the same length leg.

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May 7th, 2008, 11:55 PM

#14

07stanggt

Authorized Vendor

2007 GT

12.40@114.55

Join Date: Mar 2007

Location: Ellicott City, MD

Posts: 6,259

Originally Posted by KenDogg

thanks Piggy. this guy did it on a full length prochamber though, i would have to do it on a shorty prochamber to meet the longtubes, do you think it would fit? also, you mentioned an air noise through the prochamber, is it really annoying? where/when do you hear it? if it's bad maybe i should stay away from the mac setup

I just clicked on that link piggy sent.

Basically that is what can be done. Like i said in my last post, the prochamber is the prochamber, and what he did is buy some cats and plugged them straight into the prochamber where the leg, or "downpipe" would insert and then cut the leg to fit into the cat. That is an option to, but would certainly move the cats back further then what they normally are, we all know what code that can throw the 133.

See he is doing it that way to avoid welding it. Like i said it would be interesting to see if he were getting the 02 sensor slow response cel. The other option is to cut 9 inches out of the middle of that down pipe or "leg" and weld the cat in.

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Last edited by 07stanggt : May 7th, 2008 at 11:58 PM.

May 7th, 2008, 11:57 PM

#15

PiggySmallz

Enthusiast

2007 Mustang GT

Join Date: Feb 2007

Location: Brooklyn, NY

Posts: 843

Originally Posted by KenDogg

thanks Piggy. this guy did it on a full length prochamber though, i would have to do it on a shorty prochamber to meet the longtubes, do you think it would fit? also, you mentioned an air noise through the prochamber, is it really annoying? where/when do you hear it? if it's bad maybe i should stay away from the mac setup

you can prob get it to work with the shorty one...not sure if it would work with the collector of the header. I hear the noise all the time when i hit the gas. you hear the air rushing into the prochamber. I also have a small leak that pisses me off. When i get rid of one i find another. ARH longtubes and catted x here i come. I might keep the prochamber and mod it to fit....outside the car it sounds incredible though. i dont want to get rid of it.

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