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Old 09-23-2011, 07:44 AM   #1
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Removing cats from stock h pipe 2003-04 mach 1

I recently bought a 2003 Mach 1 and have been researching some exhaust. Would it be worth removing my cats from my h pipe and then adding a catback system?
About how much hp and sound would it free up?

Thanks
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Old 09-23-2011, 09:48 AM   #2
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I had my cats removed and had pipe welded in place of them connecting them to The stock h and into glasspack style mufflers. I immediately noticed a drop in low end power. The exhaust had a lot less back pressure. The sound much louder but I liked it. To fix my low end power loss I changed to magnaflow chambered mufflers. It helped it feel right again.
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Old 09-23-2011, 01:38 PM   #3
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So you recommend it?
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Old 09-23-2011, 02:18 PM   #4
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The sound is night and day with a cat delete. I'm sure everyone on this forum who loves the mustang sound would recommend it! I went with the cat delete h pipe and borla stingers. I get nothing but smiles from people when they hear my car
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Old 09-23-2011, 02:50 PM   #5
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I'm lookin for sound on a budget. Think I will go magnaflow. Nice on the stingers though. They sound nasty
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Old 09-23-2011, 03:08 PM   #6
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Quote:
Originally Posted by Mach1Bob
I'm lookin for sound on a budget. Think I will go magnaflow. Nice on the stingers though. They sound nasty
I did pay an arm and a leg for the exhaust. About a grand total. (still need headers) but I wasn't going to put on something that sounded ok and where nicely priced. Lol figured I would save up and buy what I really wanted.
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Old 09-23-2011, 03:32 PM   #7
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Yeah you get what you pay for. I'm just staying away from flowmaster and pypes. Anything else and I'm game. Im lookin to spend round 5-700$
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Old 09-23-2011, 04:13 PM   #8
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My catback was I think around 750. Maybe close to 8.
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Old 09-23-2011, 04:26 PM   #9
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I still have stock cats with my Mac catback and I have bbk headers and it sounds sick. I get consistent complements even with cats.
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Old 09-23-2011, 07:49 PM   #10
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Re: Removing cats from stock h pipe 2003-04 mach 1

Those 4v's sound rediculous without cats...I'd either remove the cats and get chambered mufflers, or keep the cats and get straight thru mufflers (borla, magnaflow etc) for a a loud setup that's not going to remove fillings from people's heads

An offroad midpipe and straight thru/no mufflers would be insane, but is probably going to cost more, and if you appreciate music, conversation, the fillings in your head and the ability to think, I'd stay away that setup
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Old 09-23-2011, 07:50 PM   #11
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Originally Posted by sonicpony03
Those 4v's sound rediculous without cats...I'd either remove the cats and get chambered mufflers, or keep the cats and get straight thru mufflers (borla, magnaflow etc) for a a loud setup that's not going to remove fillings from people's heads

An offroad midpipe and straight thru/no mufflers would be insane, but is probably going to cost more, and if you appreciate music, conversation, the fillings in your head and the ability to think I'd stay away that setup
+1! I heard a straight piped SVT cobra... It hurt to stand next to it at idle.
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Old 09-23-2011, 07:52 PM   #12
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Re: Removing cats from stock h pipe 2003-04 mach 1

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+1! I heard a straight piped SVT cobra... It hurt to stand next to it at idle.
As loud as straight pipes are, I don't know if I'd want to do it to an 03/04 Cobra...they sound so mean with some type of muffler tone...bassani, borla, magnaflow, they all have a distinct badass sound that the cobra emits perfectly.
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Old 09-24-2011, 01:18 AM   #13
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I have a '98 GT with no Cats and dual Flowmasters, and it is just straight wicked sounding.
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Old 09-24-2011, 07:00 PM   #14
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Borla FTW! I'd leave the cats on and go with the stingers
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Old 09-24-2011, 07:14 PM   #15
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Originally Posted by dimo
Borla FTW! I'd leave the cats on and go with the stingers
I started with the cats on when I put my stingers on. It's sounded good, but it wasn't deep enough and when the engine warmed up it was barely louder than stock. Now that I have the cats off the car is so loud! It sounds amazing, the only problem is that with it being so loud I can't drive the car hard on the street without grabbing attention from every cop around.

So if anything, get a high flow cat. I heard those help a lot with the sound. But just ask around
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Old 09-24-2011, 07:45 PM   #16
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Quote:
Originally Posted by S197Miller

I started with the cats on when I put my stingers on. It's sounded good, but it wasn't deep enough and when the engine warmed up it was barely louder than stock. Now that I have the cats off the car is so loud! It sounds amazing, the only problem is that with it being so loud I can't drive the car hard on the street without grabbing attention from every cop around.

So if anything, get a high flow cat. I heard those help a lot with the sound. But just ask around
Good point on the stock cats, I have high flows with JBA shorty headers... Stupid emissions requirements
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Old 09-24-2011, 08:22 PM   #17
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Did you still pass emissions with the high flow?
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Old 09-24-2011, 09:29 PM   #18
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Re: Removing cats from stock h pipe 2003-04 mach 1

I wouldn't just gut your stock cats.

I like the midpipe I have, it's the 5 piece Bassani X pipe. I have hi flow cats I can bolt in place if I want, but I choose to run offroad on a daily basis.

My setup is stock manifolds, o/r x, and bassani catback. Sounds good in my opinion and have had 2 fellow 4v owners in town change their exhaust setup to mine.
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Old 09-24-2011, 10:06 PM   #19
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Originally Posted by S197Miller
Did you still pass emissions with the high flow?
Yes, in pa I did. That's the only reason to have them, otherwise I would've gone with borla's LT headers
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Old 09-24-2011, 11:00 PM   #20
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I would re-do your entire exhaust. You can never go wrong with that.

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Old 09-25-2011, 09:34 AM   #21
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Alright so what system should I go with? Lookin to spend round 4-700$. I can do the labor myself so I just need the price of the parts. And I don't really want an x pipe
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Old 09-25-2011, 10:42 AM   #22
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Quote:
Originally Posted by Mach1Bob
Alright so what system should I go with? Lookin to spend round 4-700$. I can do the labor myself so I just need the price of the parts. And I don't really want an x pipe
One thing about this forum.... When you ask an exhaust question you'll get 10 different answers. Lol what I suggest is for you to go to a car show and just listen to some other mustangs. So you know exactly what it sounds like.
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Old 09-25-2011, 11:20 AM   #23
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Re: Removing cats from stock h pipe 2003-04 mach 1

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Alright so what system should I go with? Lookin to spend round 4-700$. I can do the labor myself so I just need the price of the parts. And I don't really want an x pipe
Honestly, 4-700 bucks won't buy you a whole lot...
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Old 09-25-2011, 12:09 PM   #24
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I beg to differ. I know I can get a good catback for that
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Old 09-25-2011, 02:07 PM   #25
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I beg to differ. I know I can get a good catback for that
You prob could get a decent axel-back for that, but I think he was referring to your ability to do a header-back system on that budget.
If that's all you're looking to spend, I'd do the axel-back now and worry ab the cats later when you're messin with the rest of the system
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Old 09-25-2011, 06:07 PM   #26
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Originally Posted by dimo

You prob could get a decent axel-back for that, but I think he was referring to your ability to do a header-back system on that budget.
If that's all you're looking to spend, I'd do the axel-back now and worry ab the cats later when you're messin with the rest of the system
Yeah i realized that. I'm just gonna get an axel back for now. I can't afford a full setup
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Old 10-16-2014, 08:38 AM   #27
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I had my cats removed and had pipe welded in place of them connecting them to The stock h and into glasspack style mufflers. I immediately noticed a drop in low end power. The exhaust had a lot less back pressure. The sound much louder but I liked it. To fix my low end power loss I changed to magnaflow chambered mufflers. It helped it feel right again.
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