H vs. X Pipe?
2nd Gear Member
Joined: Sep 2009
Posts: 227
From: Va
There is some difference between the automatic and the manual mufflers. Someone posted a picture looking down through the tail pipe. The manual does have some deeper tone.
And if you bought the GT500 mufflers up to the 2010, then you have mufflers for an automatic. Ford used the stock automatic muffler for the GT500.
And if you bought the GT500 mufflers up to the 2010, then you have mufflers for an automatic. Ford used the stock automatic muffler for the GT500.
Well, I guess if Ford decided that the stock automatic muffler is good enough for the GT500...they're gonna be good enough for my lil' sixer.
1st Gear Member
Joined: Mar 2009
Posts: 149
From: IL
I just bought two GT takeoffs, F1-7991-L/R, ...are you saying these came off an Automatic and that there is a material difference between these and mufflers off a Manual GT?
I've been reading thread after thread, googling my a&& trying to understand exhaust options.....this is the first time someone has said there is a difference between mufflers from a manual or automatic GT.
Someone please provide some clarity.
I've been reading thread after thread, googling my a&& trying to understand exhaust options.....this is the first time someone has said there is a difference between mufflers from a manual or automatic GT.
Someone please provide some clarity.
If yours are 7991 instead of 7849's, they came off an auto and are more restrictive and quieter.
2nd Gear Member
Joined: Sep 2009
Posts: 227
From: Va
OK...so I call two muffler shops today in my local area of Virginia. I inquire about installing my GT takeoffs as well as an X pipe. This old timer tells me that configuration is illegal in this state and that he would be subject to a $2,500 fine.
The next shop I called said he could install the mufflers and either an X pipe or H pipe, but he tells me frankly that unless I am running at 6,000 RPMs, the crossover (X or H) is absolutely useless. I told him about all these guys on this forum and how they boast of HP gains by converting the V6 single to duals. He said manufactures will want to make you believe that so you buy their products.....and the people talking about their HP gains by simply installing duals are fooling themselves. He goes on to say he has been doing muffler work for 30 years.
Well...don't shoot the messenger, I am just repeating what two muffler shops told me today. You would think that they would be happy to take my money and install the duals and let me go about my way...but instead one says its illegal and the other says there is nothing to gain except the difference in sound.
Lastly.....TPLSTNG....how do you know the Auto GT mufflers are more restrictive and quieter. Are you simply repeating something you heard elsewhere ....or is it your opinion....or do you know because you really know all about this stuff? I don't doubt you and I really don't care...I am installing them, I would just like to know how you can back that statement up.
The next shop I called said he could install the mufflers and either an X pipe or H pipe, but he tells me frankly that unless I am running at 6,000 RPMs, the crossover (X or H) is absolutely useless. I told him about all these guys on this forum and how they boast of HP gains by converting the V6 single to duals. He said manufactures will want to make you believe that so you buy their products.....and the people talking about their HP gains by simply installing duals are fooling themselves. He goes on to say he has been doing muffler work for 30 years.
Well...don't shoot the messenger, I am just repeating what two muffler shops told me today. You would think that they would be happy to take my money and install the duals and let me go about my way...but instead one says its illegal and the other says there is nothing to gain except the difference in sound.
Lastly.....TPLSTNG....how do you know the Auto GT mufflers are more restrictive and quieter. Are you simply repeating something you heard elsewhere ....or is it your opinion....or do you know because you really know all about this stuff? I don't doubt you and I really don't care...I am installing them, I would just like to know how you can back that statement up.
Last edited by 08 Pony Package; Dec 7, 2009 at 07:40 PM.
3rd Gear Member
Joined: Jun 2009
Posts: 750
From: CA
I bought GT take-offs from someone here on the forum and I specifically asked if they were from a manual because that is the flow and sound I wanted. I was assured they were. Later he told me they were GT500 mufflers. Does that mean I really bought GT automatic mufflers? That sucks!
Thread Starter
4th Gear Member
Joined: Oct 2009
Posts: 1,335
From: Buffalo, New York
OK...so I call two muffler shops today in my local area of Virginia. I inquire about installing my GT takeoffs as well as an X pipe. This old timer tells me that configuration is illegal in this state and that he would be subject to a $2,500 fine.
The next shop I called said he could install the mufflers and either an X pipe or H pipe, but he tells me frankly that unless I am running at 6,000 RPMs, the crossover (X or H) is absolutely useless. I told him about all these guys on this forum and how they boast of HP gains by converting the V6 single to duals. He said manufactures will want to make you believe that so you buy their products.....and the people talking about their HP gains by simply installing duals are fooling themselves. He goes on to say he has been doing muffler work for 30 years.
Well...don't shoot the messenger, I am just repeating what two muffler shops told me today. You would think that they would be happy to take my money and install the duals and let me go about my way...but instead one says its illegal and the other says there is nothing to gain except the difference in sound.
Lastly.....TPLSTNG....how do you know the Auto GT mufflers are more restrictive and quieter. Are you simply repeating something you heard elsewhere ....or is it your opinion....or do you know because you really know all about this stuff? I don't doubt you and I really don't care...I am installing them, I would just like to know how you can back that statement up.
The next shop I called said he could install the mufflers and either an X pipe or H pipe, but he tells me frankly that unless I am running at 6,000 RPMs, the crossover (X or H) is absolutely useless. I told him about all these guys on this forum and how they boast of HP gains by converting the V6 single to duals. He said manufactures will want to make you believe that so you buy their products.....and the people talking about their HP gains by simply installing duals are fooling themselves. He goes on to say he has been doing muffler work for 30 years.
Well...don't shoot the messenger, I am just repeating what two muffler shops told me today. You would think that they would be happy to take my money and install the duals and let me go about my way...but instead one says its illegal and the other says there is nothing to gain except the difference in sound.
Lastly.....TPLSTNG....how do you know the Auto GT mufflers are more restrictive and quieter. Are you simply repeating something you heard elsewhere ....or is it your opinion....or do you know because you really know all about this stuff? I don't doubt you and I really don't care...I am installing them, I would just like to know how you can back that statement up.
1st Gear Member
Joined: Mar 2009
Posts: 149
From: IL
OK...so I call two muffler shops today in my local area of Virginia. I inquire about installing my GT takeoffs as well as an X pipe. This old timer tells me that configuration is illegal in this state and that he would be subject to a $2,500 fine.
The next shop I called said he could install the mufflers and either an X pipe or H pipe, but he tells me frankly that unless I am running at 6,000 RPMs, the crossover (X or H) is absolutely useless. I told him about all these guys on this forum and how they boast of HP gains by converting the V6 single to duals. He said manufactures will want to make you believe that so you buy their products.....and the people talking about their HP gains by simply installing duals are fooling themselves. He goes on to say he has been doing muffler work for 30 years.
Well...don't shoot the messenger, I am just repeating what two muffler shops told me today. You would think that they would be happy to take my money and install the duals and let me go about my way...but instead one says its illegal and the other says there is nothing to gain except the difference in sound.
Lastly.....TPLSTNG....how do you know the Auto GT mufflers are more restrictive and quieter. Are you simply repeating something you heard elsewhere ....or is it your opinion....or do you know because you really know all about this stuff? I don't doubt you and I really don't care...I am installing them, I would just like to know how you can back that statement up.
The next shop I called said he could install the mufflers and either an X pipe or H pipe, but he tells me frankly that unless I am running at 6,000 RPMs, the crossover (X or H) is absolutely useless. I told him about all these guys on this forum and how they boast of HP gains by converting the V6 single to duals. He said manufactures will want to make you believe that so you buy their products.....and the people talking about their HP gains by simply installing duals are fooling themselves. He goes on to say he has been doing muffler work for 30 years.
Well...don't shoot the messenger, I am just repeating what two muffler shops told me today. You would think that they would be happy to take my money and install the duals and let me go about my way...but instead one says its illegal and the other says there is nothing to gain except the difference in sound.
Lastly.....TPLSTNG....how do you know the Auto GT mufflers are more restrictive and quieter. Are you simply repeating something you heard elsewhere ....or is it your opinion....or do you know because you really know all about this stuff? I don't doubt you and I really don't care...I am installing them, I would just like to know how you can back that statement up.
1st Gear Member
Joined: Mar 2009
Posts: 149
From: IL
OK, so since we are now certain you have the autos, what would you say now about the mufflers knowing what you now know and having run one for a while? I'm planning on doing the same thing and would like your opinion. Is it louder than the V6? Does it drone? Was it worth the swap? Have you noticed any performance improvements? I'm assuming it bolted right up to the V6 pipes without any modifications.
I just wish mine sounded as good as this...if it did I probably wouldn't mess with going to duals.
http://www.youtube.com/watch?v=9rJ-uwPtEXU
Last edited by TPLSTNG; Dec 8, 2009 at 12:19 AM.
