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Old 11-21-2011, 11:44 AM   #43
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I don't think cats are too hard to "gut".
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Old 11-21-2011, 11:46 AM   #44
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Didn't a manufacturer make cats that looked stock, but were completely gutted (maybe they were just high flows)? Was that ADM?? I can't find the link to purchase them though.
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Old 11-21-2011, 12:03 PM   #45
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If they existed
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Old 11-21-2011, 12:35 PM   #46
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Didn't a manufacturer make cats that looked stock, but were completely gutted (maybe they were just high flows)? Was that ADM?? I can't find the link to purchase them though.
It was TSP but it was for their headers...not sure if they would work with yours..depends on your headers.

Gutting a set of cats is about as hard as unzipping your fly so if you can do that then you are probably good. Many vendors sell test pipes with their headers too...no cats at all.
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Old 11-21-2011, 12:40 PM   #47
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
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Old 11-21-2011, 01:05 PM   #48
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It was TSP but it was for their headers...not sure if they would work with yours..depends on your headers.

Gutting a set of cats is about as hard as unzipping your fly so if you can do that then you are probably good. Many vendors sell test pipes with their headers too...no cats at all.
Lol, thanks man. That sounds easy enough.
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Old 11-21-2011, 01:58 PM   #49
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
I think most of the failures occured on cars above 600rwhp. But why waste the money now that we know this. Go with straight pipes, keep your stock cats for inspection time.

Plus the car sounds soooo much better without cats.
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Old 11-21-2011, 02:39 PM   #50
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
I have just north of 500 rwhp and my HF cats were melted.
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Old 11-21-2011, 02:47 PM   #51
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I guess here in Germany we're screwed with that sort of issue...
Gutting the cats is tax fraud over here

If all of that is true I'm soooo looking for some of the aftermarket guys out there to step up with a solution!

Better check mine soon...
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Old 11-21-2011, 02:52 PM   #52
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
It is Not about HP it is about cubic Inches per my explanation above.

Exhaust gas temps are the same at 100 hp or 1000 hp when tuned correctly.
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Old 11-21-2011, 02:55 PM   #53
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BTW the picture I posted up was 570whp with high flow cats. Listen to jannety.
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Old 11-21-2011, 05:01 PM   #54
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A while back my friend(who is a mechanic) thought he heard an exhaust leak after I had my car modded to 445RWHP and after installing SW headers and Cats. We put the car on the rack with it running and did a thorough check of the joints. We found no leaks, but we did notice that one of the Cats had turned a cherry red color. The other Cat just looked normal. We could not find the temperature device. So, we checked it the next day and both Cats stayed the same color. Found the device and the temperature reading on day 2 read between 530 -550F. We pulled the Cats off and there was no melting or damage. Really strange.
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Old 11-21-2011, 09:16 PM   #55
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OK, I was wondering about this glad someone brought it up. I know several mustang guys who have had their high flow cats go out on blown cars. So it can happen to us as well I see.

Next project gut the cats.. So Ted or anybody that has done this, have you seen a small boost drop going from high flow cats to gutted cats in the mid to high rpm range? If so how much at peak?
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Old 11-22-2011, 05:57 AM   #56
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I would really love to find cats that can handle FI. Sure, we can gut them and look legal, or go with straight pipe and swap in cats for inspection. But I hate the smell of these cars without cats. It is also not very environment-friendly. I think that I'll call American Racing to see what they say.
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