Question for Stillen Exhaust owners

Red370

I didnt really notice it until recently, maybe I always have my music too loud, who knows. But right when I turn the car off, theres a consistent thud I hear, not a metallic thud either, and it sounds like its coming from right around the resonator area, i've never had this happen with any exhaust setup in my life. Now, one would think "hey, its just the metal cooling off after being heated", and thats what I initially thought. It never happened with the stock exhaust on my car once. You can actually hear the thud from inside the cabin, and its even more prevalent when you peek down underneath the car. To describe the sound, it sounds like someone is flicking the pipe with their finger around every 8-10 seconds or so. Not sure if this is normal or not, has anyone else had the same experience? I personally torqued each bolt as tight as possible, so i guarantee theres zero chance of it having a leak or loose bolt.

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

mattkim85

does the same thing on mine.

i am no expert, but like you said, i think its the heated metal cooling off.

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Fast Intentions CBE 18" , Berk HFCs, Injen CAI, KW V3, Rear SPC Camber Kit, VOLK RE30's

Red370

I've just never heard an exhaust make such a loud thud from cooling, usually you hear little metallic "tink" sounds, glad im not the only one thats hearing it though!

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

spearfish25

In the summer time, it's very noticeable. No worries.

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2013 Cadillac V-Wagon, RIP Z

Red370

ahh, comfort, I <3 you guys.

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

Red370

i'm curious if any of the other systems have this same problem

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

spearfish25

any metal exhaust will make this pinging sound on cool down

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2013 Cadillac V-Wagon, RIP Z

Red370

I never had that with the magnaflow I had on my G, or the Injen I had on my GSX, which is why it seemed new to me. I know exhausts will make a pinging sound when they cool, but this one thuds more than pings ya know?

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

spearfish25

Haven't really noticed any thuds. Video?

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2013 Cadillac V-Wagon, RIP Z

Red370

i'll record it tomorrow, happens every time I drive and park it, shouldnt be too hard to get.

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

NewlyIMPORTed

red till have you know that ridiculous picture you have distracts me haha

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2011 WRX STICobb Accessport, Nameless Performance exhaust, COBB SF Intake, COBB downpipe, 20% tint, Work Emotion XD9's

Red370

what is it with you people making fun of me! I'm working on having my teeth fixed, geez!

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs