Heartthrob CB (stock mufflers) installed - Ford Mustang Forum
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post #1 of 18 (permalink) Old 01-12-2011 Thread Starter
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Heartthrob CB (stock mufflers) installed

Hello,
New to the forums here and this is my first post. I have a 2011 manual GT and have installed the Heartthrob kit #1429050 (S/S CB w/stock mufflers). The quality of the exhaust is great and with the stock mufflers it sounds the same to me. I do have a question/concern and am curious if anyone else has experienced this. After the car reaches operating temperature and is shut off there are ,what I would describe as, loud pinging and tinging noise coming from the h-pipe and resonator area of the exhaust. The stock system did not make these noises. I also have a noise that comes from the rear when I go over a significant bump (it is a dull thump type noise). Has anyone had any of these type issues and/or clearance issues with this exhaust? Any inputs would be appreciated.

Sean

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2011 GT, 6spd, Candy Red, Brembo, EP, Glass roof, HT exhaust/Magnaflow mufflers/Steeda CAI/SCT tuner/Barton shifter/RTR wheels.
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post #2 of 18 (permalink) Old 01-12-2011
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It's normal. I'm making the assumption that your pipes are stainless steel. The stock pipes are ceramic coated. Your pipes get really hot when you drive. The pinging sound is from them cooling off.

Do you really like your stock mufflers? That was one of the first things that I changed.


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post #3 of 18 (permalink) Old 01-13-2011
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Over the axle pipes probably need to be adjusted better to take care of noise your hearing when hitting bumps.
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post #4 of 18 (permalink) Old 01-13-2011
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Quote:
Originally Posted by blackshep01 View Post
It's normal. I'm making the assumption that your pipes are stainless steel. The stock pipes are ceramic coated. Your pipes get really hot when you drive. The pinging sound is from them cooling off.

Do you really like your stock mufflers? That was one of the first things that I changed.
The OE pipes are not ceramic coated. They are 409-grade stainless steel. The pinging, though, is indeed the pipes contracting as they cool off. The aftermarket pipes, being (probably) a different material/gauge are contracting/cooling at a different rate than the OE did, so you get that pinging noise.
The thumping is, as pointed out, either a basic fitment (design) issue, or an adjustment issue.
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post #5 of 18 (permalink) Old 01-13-2011
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Are you using stock resonators?Any HP gain?

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post #6 of 18 (permalink) Old 01-13-2011 Thread Starter
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Quote:
Originally Posted by blackshep01 View Post
It's normal. I'm making the assumption that your pipes are stainless steel. The stock pipes are ceramic coated. Your pipes get really hot when you drive. The pinging sound is from them cooling off.

Do you really like your stock mufflers? That was one of the first things that I changed.
The pipes are stainless steel. Yes, I agree the pinging sounds are from cooling off but I have never heard a car make sounds this loud.


No, I don't like the stock mufflers. I want to replace them I just have not found a set I like.

2011 GT, 6spd, Candy Red, Brembo, EP, Glass roof, HT exhaust/Magnaflow mufflers/Steeda CAI/SCT tuner/Barton shifter/RTR wheels.
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post #7 of 18 (permalink) Old 01-13-2011 Thread Starter
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Quote:
Originally Posted by FC31964 View Post
Are you using stock resonators?Any HP gain?
No, the HT system came with resonators, they can be seen in the picture. I have not had the car on a dyno so I can't say I have seen any HP gains.

2011 GT, 6spd, Candy Red, Brembo, EP, Glass roof, HT exhaust/Magnaflow mufflers/Steeda CAI/SCT tuner/Barton shifter/RTR wheels.
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post #8 of 18 (permalink) Old 01-15-2011
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Quote:
Originally Posted by tyndallcbr View Post
......I also have a noise that comes from the rear when I go over a significant bump (it is a dull thump type noise). Has anyone had any of these type issues and/or clearance issues with this exhaust? Any inputs would be appreciated.

Sean
I had this exact issue with the Heartthrob. It turns out it was the webbing on the rear differential hitting the pipes. The problem was that the Heartthrob H-pipe was too long. The fix was to cut 3/4" off of each side of the H-pipe which allowed the over-the-axle pipes to move slightly forward and away from the rear.

Rob

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post #9 of 18 (permalink) Old 01-15-2011
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Another thing to consider is the removed flex joint in the middle of the stock H pipe. The elimination of that will no doubt amplify expansion and contraction noises since the pipes cannot move around anymore. I have longevity concerns with that. I'll be interested to see if any higher mileage systems suffer from fatigue failures down the road.

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post #10 of 18 (permalink) Old 01-15-2011 Thread Starter
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Quote:
Originally Posted by copracer288 View Post
I had this exact issue with the Heartthrob. It turns out it was the webbing on the rear differential hitting the pipes. The problem was that the Heartthrob H-pipe was too long. The fix was to cut 3/4" off of each side of the H-pipe which allowed the over-the-axle pipes to move slightly forward and away from the rear.
Thanks for the information... Which end of the h-pipe? Was it the front or the rear?

2011 GT, 6spd, Candy Red, Brembo, EP, Glass roof, HT exhaust/Magnaflow mufflers/Steeda CAI/SCT tuner/Barton shifter/RTR wheels.
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post #11 of 18 (permalink) Old 01-15-2011 Thread Starter
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Quote:
Originally Posted by 2011GrabberGT View Post
Another thing to consider is the removed flex joint in the middle of the stock H pipe. The elimination of that will no doubt amplify expansion and contraction noises since the pipes cannot move around anymore. I have longevity concerns with that. I'll be interested to see if any higher mileage systems suffer from fatigue failures down the road.
I sent an email to HT about the noise issue. Here is what they said about the flex joint... "The flex is there to provide a little movement under engine torque. The type of clamping system we (and the oem) use also provides some movement and flexibility."

2011 GT, 6spd, Candy Red, Brembo, EP, Glass roof, HT exhaust/Magnaflow mufflers/Steeda CAI/SCT tuner/Barton shifter/RTR wheels.
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I get the ping during cool down.
I don't have any contact issues going over bumps.

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Quote:
Originally Posted by tyndallcbr View Post
Thanks for the information... Which end of the h-pipe? Was it the front or the rear?
You'll want to trim the back end. The front end of the H-pipe has the "slits" in the pipe so it slides over the pipes coming off the cats.

Another thing we found was that the flanges on the Heartthrob pipes that attach to the cats were too big. When clamped down the pipes (on each side) formed a very small wrinkle which then gave me a small exhaust leak on each side. These "wrinkles" had to be welded shut to stop the leak. It's not a huge leak but if you listened for it, you could hear it.

Rob

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post #14 of 18 (permalink) Old 01-16-2011 Thread Starter
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Thanks for the information. I will take the car back to the exhaust shop tomorrow and have them look at shortening the H-pipe and checking for the leak you mentioned. I have already taken the car back once to look for the exhaust contacting the body etc... maybe this information will help figure out what is going on.

2011 GT, 6spd, Candy Red, Brembo, EP, Glass roof, HT exhaust/Magnaflow mufflers/Steeda CAI/SCT tuner/Barton shifter/RTR wheels.
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Yeah, I originally thought the exhaust was hitting the floor where the pipes go over the axle since there was not much clearance there.

Not the case. The exhaust will move up and down with the body so you don't need much clearance there. You should be able to see marks on the pipes where the rear is coming up and making contact. That was the giveaway for me.


Rob

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