Roush vs. Hushpower vs. GT500 vid - with X pipe! - Page 3 - Ford Mustang Forum
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Sorry for the dumb question, but when you mention the x pipe(no cats) does that mean you removed the cats? Also I am not quite sure what the x pipe portion is in the grand scheme of the exhaustbsetup, but it sounds like you kept some of it stock. What does changingthe x pipe give you?

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Sorry for the dumb question, but when you mention the x pipe(no cats) does that mean you removed the cats? Also I am not quite sure what the x pipe portion is in the grand scheme of the exhaustbsetup, but it sounds like you kept some of it stock. What does changingthe x pipe give you?
Not a dumb question at all, so no worries!

I replaced the stock H-pipe and the 2 short pipes that come off of the stock exhaust manifolds (the cats are in these pipes) with the Lethal Performance off-road 3"" X pipe.

Lethal Performance 2011 5.0L Mustang GT 3 Offroad X-pipe [LP-2011GTORX] : Lethal Performance, Performance parts for Ford Mustangs

I haven't had it on the dyno yet, but the Lethal website says this piece is good for 14 HP, and improves the exhaust flow.

It also lightend the car, as the off-road X weighs considerably less than the parts it replaces.

A tune is required for the off-road X in order to turn off the second set of O2 sensors, and to prevent the dumping of fuel intended to cool the cats that no longer exist.

Hope that helps!


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Not a dumb question at all, so no worries!

I replaced the stock H-pipe and the 2 short pipes that come off of the stock exhaust manifolds (the cats are in these pipes) with the Lethal Performance off-road 3"" X pipe.

Lethal Performance 2011 5.0L Mustang GT 3 Offroad X-pipe [LP-2011GTORX] : Lethal Performance, Performance parts for Ford Mustangs

I haven't had it on the dyno yet, but the Lethal website says this piece is good for 14 HP, and improves the exhaust flow.

It also lightend the car, as the off-road X weighs considerably less than the parts it replaces.

A tune is required for the off-road X in order to turn off the second set of O2 sensors, and to prevent the dumping of fuel intended to cool the cats that no longer exist.

Hope that helps!
.

Can't you get a ticket or a fine for taking off cats? Would there be any benefit in replacing the h pipe and keeping the cats? I have Roush axle backs on order and wonder if changing the h pipe would be good?

Thanks, Chris
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.

Can't you get a ticket or a fine for taking off cats? Would there be any benefit in replacing the h pipe and keeping the cats? I have Roush axle backs on order and wonder if changing the h pipe would be good?

Thanks, Chris
Yes, it's illegal to modify the emissions system.

With that said, I've always ran without cats on prior cars and have been on forums like this for years, and I've never heard of anyone getting a fine for removing the cats.

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Not a dumb question at all, so no worries!

I replaced the stock H-pipe and the 2 short pipes that come off of the stock exhaust manifolds (the cats are in these pipes) with the Lethal Performance off-road 3"" X pipe.

Hope that helps!
How bad does it smell now? I hate the smell of exhaust prior to vehicles being equipped with cats...

I wonder how the heartthrob cat back (with stock cats and with h-pipe) would perform compared to your setup? ( I know they claim 22hp or somewhere around there but I find that a bit exaggerated.)
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How bad does it smell now? I hate the smell of exhaust prior to vehicles being equipped with cats...

I wonder how the heartthrob cat back (with stock cats and with h-pipe) would perform compared to your setup? ( I know they claim 22hp or somewhere around there but I find that a bit exaggerated.)
Once in a while I get a whiff after I've turned the car off. Other than that, I haven't noticed it at all.

But it is winter up here, and the windows are almost always up and the top is never down. I haven't noticed it at the drive thrus I've been at (bank, coffe shop, etc.)

I'm not sure about Hearthrob's claims either, but it seems like a lot to me too...

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Correct me if I'm wrong but it sounds like the GT500 axleback is just more of a "tame" sounding version of the roush? I personally hate the HP's and couldn't believe you took the roush's off and sold them (with the x and roush though it sounded too loud.)

To me I think you found the best combination for what you have running...

Roush-needs stock exhaust (no X)
GT500-needs x-pipe
I was thinking the same things as I watched the videos. I have Roush and love them. But with the xpipe I liked the GT500 better.
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I was thinking the same things as I watched the videos. I have Roush and love them. But with the xpipe I liked the GT500 better.
Yup!

The one piece you guys are missing though is the drone - HP and Roush drone on my car, the GT500 has no drone at all.

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Any thoughts of the sound with stock pipes with the GT500's
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Yup!

The one piece you guys are missing though is the drone - HP and Roush drone on my car, the GT500 has no drone at all.
I can only imagine the drone and overall amount of noise in general with a x-pipe attached!

My buddy's stock car vibrates all over from the sound of the roush with the rest of the car stock! X-pipe would be too much, IMO.
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Any thoughts of the sound with stock pipes with the GT500's
I'd like to know the answer to that question as well. Is the X-pipe the difference maker or do the GT500s sound good, with the rest of the exhaust being stock?

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Stock mid pipe/gt500 mufflers

YouTube - 2011 Mustang GT 5.0 with GT500 exhaust mufflers

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Any thoughts of the sound with stock pipes with the GT500's
I got the GT500 mufflers only on my GT/CS, the rest is stock. You can hear the exhaust in different parts of the video. Hope that helps.

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AC, so in your opinion, the GT500 is a worthwhile good upgrade, with the sound being deeper. And also you video was very entertaining.
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Quote:
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AC, so in your opinion, the GT500 is a worthwhile good upgrade, with the sound being deeper. And also you video was very entertaining.
Thanks!
Oh yes, just the GT500 Mufflers are very worth it, the video doesn't represent the reality that well, the sound is totally awesome and nothing close to the stock Mufflers; they're really worth it and I love it!
I would recommend them to anyone! The tips are bigger (4") makes the rear end looks meaner, and the sound is just a thrill, I find myself not listening to the radio more often than before, just to hear that rumble!
Plus, these are Ford Racing parts, so I'd rather stay with what's factory for the warranty and even for being stock on the GT500; I don't want to turn my Mustang into a tuning cruiser...
The good thing with these Mufflers, is that you have the nice rumble at low speed, the deep sound when you step on it, but then on the freeway on 6 gear, they're not that loud (almost as stock), so you won't have too much noise when driving long distances on the highway; that's of course if you don't step on it...
As you can see, I don't regret 1 second my purchase.



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