stock h-pipe mod?

lbisurfer · November 3rd, 2009, 02:26 PM

would removing the rear resonators/pre-cats make the car any louder or free up any power??

realrider88 · November 3rd, 2009, 02:39 PM

yea both, a little bit..

asiansensation78 · November 3rd, 2009, 02:54 PM

Are you referring to the mufflers or the cats?
I think removing either one would give you a bit more sound and power, though removing the cats would make the biggest difference.

lbisurfer · November 3rd, 2009, 02:59 PM

im referring to the rear "cats"..i live in NJ and im worried about going catless...

dcook_14 · November 3rd, 2009, 04:29 PM

If you don't have emissions, but an O/R midpipe. If you have to pass emissions get a catted midpipe, they should be high flow cats. It'll make a hell of a difference in sound, a little bit of power. The mid-pipe is the biggest choking point of the stock mustang exhaust.

suprajay79 · November 3rd, 2009, 04:40 PM

Originally Posted by dcook_14

The mid-pipe is the biggest choking point of the stock mustang exhaust.

This is 100% true. I never realized how badly my exhaust was held back by the stock mid pipe. Bolting on the H-pipe turned it into my favorite mod.

Oh, DCook, I think you meant "buy," not "but."

03_StangGuy · November 3rd, 2009, 05:02 PM

If your gonna remove the rear cats, you may as well look into a set of high flow cats and replace all 4.

wrr1020 · November 3rd, 2009, 05:06 PM

I wanna run an aftermarket mid pipe but being in Cali and having the smog nazis enforcing all these rules it might be hard to do. I was thinking of going with the MRT catted h but there pretty damn expensive.

liljojo4711 · November 3rd, 2009, 08:49 PM

u can get a catless h-pipe for like $150 and then when emissions come up, swap ur stock pipe with cats back on. its like a 20 minute ordeal...

wrr1020 · November 3rd, 2009, 09:42 PM

Originally Posted by liljojo4711

u can get a catless h-pipe for like $150 and then when emissions come up, swap ur stock pipe with cats back on. its like a 20 minute ordeal...

Only problem i'd have with that is the random road side emissions tests California has. I'd be fucked if i was pulled to go in there. And i've seen it happen in my city, a route i take to work is just one of the streets they use to do these tests. It's ridiculous

Mathos1 · November 3rd, 2009, 09:49 PM

I just had that done to my car, they removed all 4 cats, and welded 2 dummy cats on straight pipes, all this done on the stock h pipe.
Heres a few follow ups:
a) The MIL lit up 2 weeks after the mod.
b) It got louder about 20x more, and since i use SLP LM1.. well it gets pretty crazy.
c) You can smell exhaust fumes alot more.
I live down south Texas, Rio Grande Valley to me exact, where 80% of teenagers have either modded camaro's firebirds or mustangs lol.. oh or pickups.
Cops don't really care about those mods.

02gtmustang · November 3rd, 2009, 10:09 PM

I'm down in south texas as well by corpus christi...I'm catless with cherry bomb's on the stang and my old K5 blazer is totaly straightpipe :-) so fuck the cops...lol but if u have emission nazi's like in cale ur best bet is a hi flow catted H cause when you remove those 2 cat's you may not be able to pass then your totaly ef'd in the ay bro... That would suck ass...

lbisurfer · November 3rd, 2009, 10:41 PM

Originally Posted by liljojo4711

u can get a catless h-pipe for like $150 and then when emissions come up, swap ur stock pipe with cats back on. its like a 20 minute ordeal...

i never thought of that.......good idea

Mathos1 · November 4th, 2009, 01:43 AM

Heres kind of a demo sound of what a stang would sound like with straight pipes, xept SLP LM1. sound quiality isnt the greatest but you get a general idea..
i recorded it today at my friends house, i hope it helps..

http://www.youtube.com/watch?v=RGVRk_hfBtY

00redgt · November 4th, 2009, 08:44 AM

i had my back 2 took off, and i barley notice any difference ,but when i took the front 2 off,yeah baby

AndrewA. · November 4th, 2009, 12:20 PM

IMO i would not start hacking your stock mid pipe and piecing in other parts. Just buy a o/r or a high flow cat mid pipe. It can get kinda.."ghetto" hacking parts.

03_StangGuy · November 4th, 2009, 01:07 PM

Originally Posted by liljojo4711

u can get a catless h-pipe for like $150 and then when emissions come up, swap ur stock pipe with cats back on. its like a 20 minute ordeal...

20mins? you must work fast. And your gonna need a buddy to help you get it lined up right. not saying it cant be done but it is a bit of work.

Originally Posted by wrr1020

Only problem i'd have with that is the random road side emissions tests California has. I'd be fucked if i was pulled to go in there. And i've seen it happen in my city, a route i take to work is just one of the streets they use to do these tests. It's ridiculous

Dont they just look the car over with those? They wont cant see you have no cats.

shnouz · November 4th, 2009, 01:44 PM

from a fellow nj guy... get a catless one and when inspection rolls around swap it out like liljojo said. plus from what ive seen there are no road side emissions checks here in jers

zigbigadoru · November 4th, 2009, 01:48 PM

id say screw the cops and get the o/r pipe and keep the stock pipe for emissions. if they give you any grief about it and have to go to court just switch it out and problem solved

oh but dont they have that new law in cali now that your not allowed to use any aftermarket on your car? god cali is such a shit state for cars

liljojo4711 · November 4th, 2009, 02:55 PM

haha i didnt know they have roadside shit in cali.... that sucks. just get a catted high flow h-pipe and be done with it.

November 3rd, 2009, 02:26 PM	#1
lbisurfer Newbie 03 GT Join Date: May 2008 Location: NJ Posts: 12	stock h-pipe mod? would removing the rear resonators/pre-cats make the car any louder or free up any power?? __________________ 03 GT- Accufab 70mm TB & Plenum...CAI...Flowmaster 40's...MM ST Brace...Work in Progress

November 3rd, 2009, 02:54 PM	#3
asiansensation78 Regular 02 GT Vert 15:43.28@25.21 Too many naked bitches in the back Join Date: Jul 2009 Location: Miami Posts: 202	Are you referring to the mufflers or the cats? I think removing either one would give you a bit more sound and power, though removing the cats would make the biggest difference. __________________ Going in as soon as I find a jacked bald guy to sit in my car to tell me I'm granny shiftin' and not double clutchin' like I should Don't want your 75 shot jets anymore? PM me and I'll buy them. Size 40 & 26

November 3rd, 2009, 02:59 PM	#4
lbisurfer Newbie 03 GT Join Date: May 2008 Location: NJ Posts: 12	im referring to the rear "cats"..i live in NJ and im worried about going catless... __________________ 03 GT- Accufab 70mm TB & Plenum...CAI...Flowmaster 40's...MM ST Brace...Work in Progress

November 3rd, 2009, 04:29 PM	#5
dcook_14 Hardcore Enthusiast 2004 Mustang GT Join Date: Feb 2009 Location: Cedar Falls, IA Posts: 1,007	If you don't have emissions, but an O/R midpipe. If you have to pass emissions get a catted midpipe, they should be high flow cats. It'll make a hell of a difference in sound, a little bit of power. The mid-pipe is the biggest choking point of the stock mustang exhaust. __________________

November 3rd, 2009, 05:06 PM	#8
wrr1020 Regular 2002 Mustang GT Join Date: Oct 2009 Location: Los Angeles, CA Posts: 72	I wanna run an aftermarket mid pipe but being in Cali and having the smog nazis enforcing all these rules it might be hard to do. I was thinking of going with the MRT catted h but there pretty damn expensive. __________________

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November 3rd, 2009, 02:39 PM	#2
realrider88 Regular 2001 Mustang GT Join Date: Jul 2009 Location: Albany Posts: 188	yea both, a little bit..

November 3rd, 2009, 08:49 PM	#9
liljojo4711 Regular Join Date: Mar 2009 Location: dallas Posts: 233	u can get a catless h-pipe for like $150 and then when emissions come up, swap ur stock pipe with cats back on. its like a 20 minute ordeal... __________________ 5.4 2v swap soon

November 3rd, 2009, 09:49 PM	#11
Mathos1 Regular "2k GT" 13.9 Join Date: Jul 2007 Location: RGV Posts: 160	I just had that done to my car, they removed all 4 cats, and welded 2 dummy cats on straight pipes, all this done on the stock h pipe. Heres a few follow ups: a) The MIL lit up 2 weeks after the mod. b) It got louder about 20x more, and since i use SLP LM1.. well it gets pretty crazy. c) You can smell exhaust fumes alot more. I live down south Texas, Rio Grande Valley to me exact, where 80% of teenagers have either modded camaro's firebirds or mustangs lol.. oh or pickups. Cops don't really care about those mods. __________________ 2k Silver Gt. SLP LM1 + Straight Pipes/custom hpipe. Ford Racing 3.73's. Custom CAI. - 13.9

November 3rd, 2009, 10:09 PM	#12
02gtmustang Enthusiast 2002 Mustang GT not sure yet :-( Join Date: Jul 2009 Location: Orange Grove,TX Posts: 907	I'm down in south texas as well by corpus christi...I'm catless with cherry bomb's on the stang and my old K5 blazer is totaly straightpipe :-) so fuck the cops...lol but if u have emission nazi's like in cale ur best bet is a hi flow catted H cause when you remove those 2 cat's you may not be able to pass then your totaly ef'd in the ay bro... That would suck ass... __________________ 02 GT K&N CAI no cats FRPP drop diablo programmer cherry bomb mufflers MGW short throw shifter TFS UDP's...coming soon LT headers and 3.73 gears and some sort of a supercharger

November 4th, 2009, 08:44 AM	#15
00redgt Hardcore Enthusiast 2000 mustang gt Join Date: Oct 2007 Location: vansant,va Posts: 2,661	i had my back 2 took off, and i barley notice any difference ,but when i took the front 2 off,yeah baby __________________ Mac Flowpaths o/r/h spectre filter lowered 1.2"front-1"back

November 4th, 2009, 12:20 PM	#16
AndrewA. Hardcore Enthusiast 2001 Mustang GT 8.9@78 Join Date: Jul 2007 Location: DFW Texas Posts: 1,384	IMO i would not start hacking your stock mid pipe and piecing in other parts. Just buy a o/r or a high flow cat mid pipe. It can get kinda.."ghetto" hacking parts. __________________ Fire it up, burn it down.

November 4th, 2009, 01:44 PM	#18
shnouz Regular 2003 Mustang GT Join Date: Dec 2007 Location: Waldwick & Freehold NJ Posts: 177	from a fellow nj guy... get a catless one and when inspection rolls around swap it out like liljojo said. plus from what ive seen there are no road side emissions checks here in jers __________________

November 4th, 2009, 01:48 PM	#19
zigbigadoru Enthusiast 1997 Mustang GT Join Date: Feb 2008 Location: lansing, MI Posts: 897	id say screw the cops and get the o/r pipe and keep the stock pipe for emissions. if they give you any grief about it and have to go to court just switch it out and problem solved oh but dont they have that new law in cali now that your not allowed to use any aftermarket on your car? god cali is such a shit state for cars __________________ quote from the gathering storm: how do you fight someone who is smarter than yourself? the answer is simple. you make her think that you are sitting across the table from her, ready to play her game. then you punch her in the face as hard as you can

November 4th, 2009, 02:55 PM	#20
liljojo4711 Regular Join Date: Mar 2009 Location: dallas Posts: 233	haha i didnt know they have roadside shit in cali.... that sucks. just get a catted high flow h-pipe and be done with it. __________________ 5.4 2v swap soon

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