Exhaust without Cats - Sound? - Ford Mustang Forum
 
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post #1 of 8 (permalink) Old 03-20-2007 Thread Starter
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Exhaust without Cats - Sound?

Have an 07 GT...curious as to if anyone has experienced the sound of a stock axle back exhaust replacement and then removing the cats and how much louder it is?

Also, any legal problems?

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post #2 of 8 (permalink) Old 03-20-2007
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Major legal problems if u get caught also the car does need some back pressure also cars without cats tend to pop and spit if u rev it up high. Also current cats really don't restrict flow like the old ones did.

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post #3 of 8 (permalink) Old 03-21-2007
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Major legal problems if u get caught also the car does need some back pressure also cars without cats tend to pop and spit if u rev it up high. Also current cats really don't restrict flow like the old ones did.
Major Legal Problems is right. In AZ it is a $10,000 fine. Now the good news, you aren't likely to get caught. Not too many cops are going to lay on hot asphalt to see if you have cats or not. When you emissions now, they rarely look, just plug in to see if you have any error codes in your PCM as long as you are a 97 or newer...

I put a basani X w/o cats on my last 98. It snarled and popped. It was NOTICEABLY louder. Turned heads. I did mufflers at the same time. I liked it, but it is all relative. Personal choice.

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post #4 of 8 (permalink) Old 03-22-2007
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If you remove the cats on your 07 GT, you will most likely set some codes, more than likely catylyst efficiency codes, and probably both lean and rich codes. In AZ, they usually just hook up a scanner to OBD II cars, check emissions monitors and the check engine light status.

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post #5 of 8 (permalink) Old 03-22-2007
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Originally Posted by StalkerStang View Post
If you remove the cats on your 07 GT, you will most likely set some codes, more than likely catylyst efficiency codes, and probably both lean and rich codes. In AZ, they usually just hook up a scanner to OBD II cars, check emissions monitors and the check engine light status.
But he can get eliminators. That would solve the codes....

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post #6 of 8 (permalink) Old 03-22-2007
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Quote:
Originally Posted by vthowe View Post
Have an 07 GT...curious as to if anyone has experienced the sound of a stock axle back exhaust replacement and then removing the cats and how much louder it is?

Also, any legal problems?
I wouldn't suggest doing that until it is out of warranty. If something goes wrong, you could end up trying to battle Ford for warranty work. They could throw a number of things at you and void your warranty, then you're in a legal battle. If you must do it, be careful and speak to an inspector about what they are supposed to check.

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post #7 of 8 (permalink) Old 03-22-2007
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I got the Pypes O/R H pipe from Brenspeed. Its relatively cheap and easy to install. I also got their MIL eliminators and I've yet to see a code. I would say buy it and if your worried about your warranyty you can put the stock pipe back on when you go in for service. It really only takes about an hour to change. I think you will love the sound after the cats are gone.
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post #8 of 8 (permalink) Old 03-22-2007
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As long as you have the MIL's you should be ok, jsut remember, if something goes wrong aka check engine light, make sure you hook your stock set-up back on.

Jesse Berger
90 LX, Previous 4 cyl.
408W In the Works
TW FAC's, Jay Allen cam, Super Victor

2001 V6 5 Speed Daily Driver
Windstar Intake, Dual Exhuast, CAI, Headers
Best ET: [email protected] mph (on 18's)
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