Ebay y pipe
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
The stock muffler is that big I'm shure it would be hard to tell the difference. With the big stock muffler, a huge cat and lots of tubing I can see why you wouldn't notice a sound difference with the new Y. But I'm willing to bet some flutter is there.
I first reported no flutter when I put the ebay Y on my dads truck but after I rode in it a few times I heard flutter. Only reason it was hard to hear was because of the loud exhaust he had. His truck has a lignting style exhaust with a FM50 SUV sido and a univ catco cat. The Y shure made it louder between 2k-3k rpm and actually made it sound better. Hes tired of it now so I'm putting on a Force II FM catback with the FM70 on it for him. I'll probably wrap the Y with header wrap to help cut down on the flutter.
I first reported no flutter when I put the ebay Y on my dads truck but after I rode in it a few times I heard flutter. Only reason it was hard to hear was because of the loud exhaust he had. His truck has a lignting style exhaust with a FM50 SUV sido and a univ catco cat. The Y shure made it louder between 2k-3k rpm and actually made it sound better. Hes tired of it now so I'm putting on a Force II FM catback with the FM70 on it for him. I'll probably wrap the Y with header wrap to help cut down on the flutter.
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Junior User
Joined: May 2008
Posts: 55
Likes: 0
From: Alamogordo
Well I have the FM 40 w/dual outlets one pipe to each side of the truck after the tires. 4" tips. Sounded great before the y pipe. Now its totally different and sounds like a v6. SO I'm kinda at a loss of what to do.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Flutter doesn't worry me - my '74 highboy had it big time with the FE 390 in it - long-tube headers, no X/H-pipe, and of course, the FE doesn't fire bank-to-bank evenly, it fires two cylinders in the same bank. At the right RPMs, it would "flutter".
There is a resonance in my exhaust right now, at the point where Monsta's shows up in his video he posted a while back. It's probably been there all it's life, but it's so minimal compared to my 390, I never noticed it.
It's a "resonance"
There is a resonance in my exhaust right now, at the point where Monsta's shows up in his video he posted a while back. It's probably been there all it's life, but it's so minimal compared to my 390, I never noticed it.
It's a "resonance"
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Junior User
Joined: May 2008
Posts: 55
Likes: 0
From: Alamogordo
Just from drivin it for awhile i can take a good guess what the problem is. The muffler is holding it back, Im guessing just by listening, causing it to have a higher pitch. Something more free flowing or whatever will probably correct it..... hopefully.
Senior User
Joined: Jan 2009
Posts: 318
Likes: 1
From: Florida
Laughing Gas
Joined: Mar 2009
Posts: 843
Likes: 6
From: Jessup, PA
You could search on the internet and find flow rates for most popular mufflers. It isn't too hard to find a muffler that will outflow a flowmaster 40.
One problem with any chambered muffler is that they are not as adaptable to different systems as straight thru mufflers. Their design is more complex and their performance is more sensitive to engine output/setup.
One problem with any chambered muffler is that they are not as adaptable to different systems as straight thru mufflers. Their design is more complex and their performance is more sensitive to engine output/setup.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
The FM40 isn't the most free flowing muffler on the market as the matter of fact chambered mufflers in general are some of the most restrictive. Flowmasters and other chambered mufflers tend to help produce more lower rpm torque than a straight through muffler. I used to have a Dynomax Ultra Flo on my V10 and that thing flowed well over 1000 cfm. After the headers were put on my truck was V6 ricer city with that muffler on. I went to a FM70 exiting in the stock location now the truck sounds good. You need a muffler with more capacity, preferably a chambered muffler. Regardless in my experience flow isn't your problem its capacity. (Case size)
Senior User
Joined: Jan 2009
Posts: 318
Likes: 1
From: Florida
You could search on the internet and find flow rates for most popular mufflers. It isn't too hard to find a muffler that will outflow a flowmaster 40.
One problem with any chambered muffler is that they are not as adaptable to different systems as straight thru mufflers. Their design is more complex and their performance is more sensitive to engine output/setup.
One problem with any chambered muffler is that they are not as adaptable to different systems as straight thru mufflers. Their design is more complex and their performance is more sensitive to engine output/setup.
The FM40 isn't the most free flowing muffler on the market as the matter of fact chambered mufflers in general are some of the most restrictive. Flowmasters and other chambered mufflers tend to help produce more lower rpm torque than a straight through muffler. I used to have a Dynomax Ultra Flo on my V10 and that thing flowed well over 1000 cfm. After the headers were put on my truck was V6 ricer city with that muffler on. I went to a FM70 exiting in the stock location now the truck sounds good. You need a muffler with more capacity, preferably a chambered muffler. Regardless in my experience flow isn't your problem its capacity. (Case size)
Thank you for correction. My mistake.
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Junior User
Joined: Aug 2008
Posts: 81
Likes: 0
From: Boise id
i dont have headers, i have factory muffler...and the exhaust flutter drives me CRAZY. I'm looking at installing the ebay y-pipe. One concern that i have is that i have heard the 6.8 might lose low end torque? have any of you that have done this mod, had this problem?
Former Vendor
Joined: Sep 2000
Posts: 2,627
Likes: 76
From: South Carolina
X2...might thoughts as well for the 99 ymod.
New User
Joined: Jun 2008
Posts: 10
Likes: 0
i have an 2000 v10 and it doesnt have the restrictors on the factory y pipe. so would this ebay y pipe be an upgrade? i got a 3 dual 2.5 outlet faux-master and it sounds okay but its rusty. i want it to be very loud.
