Exhaust melted my rear bumber

[Meat coyote racing]

So, in a quest to quiet down my car (crazy thought for mustang owner), I have melted my rear bumper.

I have a supercharged mustang with a full 3" exhaust that I needed quieting down because I'm moving to Germany. I have a Pypes system that I cut off the last 13.75 in. and installed Vibrant ultra quiet resonators on each pipe where it meets the exhaust hanger.

The approximate distance from the new resonators and the bumper was approximately 12 in. from where the tip ended and the plastic bumper began; the tips of the resonator are tucked under the car and don't stick out of the back like a stock system. With the newly installed resonators, the angle in which they were positioned was (I assume) about 5° tilted and angled higher than original. Standing from the rear, I could clearly observe the pipes angling and pointing out of the holes of my rear valence (just 5° pointed higher)

Long story short, I went out and did a hard pull from 3rd all the way to the top of 5th. The Nguage said my cat temperature got up to 1900° (ridiculous) when I pulled my foot off the gas. The end result is pictured below. I think I can get away hiding the damage by getting a new rear valence. However, I have to buy a new taillight wiring harness and bumper support.

Lesson learned: angles matter and I suck. Good thing I'm in quarantine so people can't see me cry....I can't look myself in the mirror lol

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[lacanteen]

Ouch! That's gonna be an expensive lesson.

 

[Coosawjack]

Why didn't ya put turn downs on those resonators??

 

[Bikeman315]

You don’t suck, you’re human. We all make mistakes and we all do dumb stuff. Fortunately yours can be fixed. Only your pocketbook will be hurt.

 

[WD Pro]

That would have made some cool dash cam footage - a mustang screaming past at 150+ with its arse on fire ...

WD

 

[StangTime]

Every misfortune has an opportunity. Now you can put a custom rear difuser on it. Might even cost less than OEM.

 

[RaceRed5.0]

That exhaust had to been glowing.

 

[Cobra Jet]

So, in a quest to quiet down my car (crazy thought for mustang owner), I have melted my rear bumper.

I have a supercharged mustang with a full 3" exhaust that I needed quieting down because I'm moving to Germany. I have a Pypes system that I cut off the last 13.75 in. and installed Vibrant ultra quiet resonators on each pipe where it meets the exhaust hanger.

The approximate distance from the new resonators and the bumper was approximately 12 in. from where the tip ended and the plastic bumper began; the tips of the resonator are tucked under the car and don't stick out of the back like a stock system. With the newly installed resonators, the angle in which they were positioned was (I assume) about 5° tilted and angled higher than original. Standing from the rear, I could clearly observe the pipes angling and pointing out of the holes of my rear valence (just 5° pointed higher)

Long story short, I went out and did a hard pull from 3rd all the way to the top of 5th. The Nguage said my cat temperature got up to 1900° (ridiculous) when I pulled my foot off the gas. The end result is pictured below. I think I can get away hiding the damage by getting a new rear valence. However, I have to buy a new taillight wiring harness and bumper support.

Lesson learned: angles matter and I suck. Good thing I'm in quarantine so people can't see my cry....I can't look myself in the mirror lol

out of curiosity, were you purposefully trying to hide the exhaust - so that it could not be seen from the rear?

Only asking because reading your post, it seems you had intent on hiding the exhaust by terminating it shorter, not installing exhaust tips and angling it higher than normal.

Back in the Fox days, doing what you did would be to go tailpipe-less and dumping the exhaust under the middle of the car. Use of turn downs is a must, otherwise you’re heating the entire underside of the car and if catless, add to the list of choking yourself out at idle while at stoplights...

I would get under the car and make sure there’s no other heat damages aside from what you already found.

I would also check your tune if you’re running THAT hot...

 

[Armageddon Turbo]

Thats an extremely high cat temp. Makes me think something else is wrong.

 

[Gregs24]

Lucky that didn't catch fire never mind melt a bit !

 

[Meat coyote racing]

Thats an extremely high cat temp. Makes me think something else is wrong.

I was data logging when I did the pulls, I came home and the log looks fine. The car made around 800 wheel. I know supercharged stangs and cats are risky; however, the fact that they start to melt at 2,000° and I was at 1900° is horrifying

 

[Meat coyote racing]

Lucky that didn't catch fire never mind melt a bit !

That was my exact thought

 

[WildHorse]

Thats an extremely high cat temp. Makes me think something else is wrong.

Makes me think that cat disintegrated plugged the pipe, heat built up like crazy and that's the end result.

 

[tcman54]

Melted rear bumper....sounds like a personal problem

TC

 

[Meat coyote racing]

Makes me think that cat disintegrated plugged the pipe, heat built up like crazy and that's the end result.

This comment literally scared me into removing the entire exhaust system. I can report that after removing the header midpipe, I have confirmed the cats are still intact. Moreover, they look PERFECT .

The only thing I observed was my downstream O2 sensors were orange as f*** from Boostane .

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