Exhaust
Senior User
Joined: Nov 2000
Posts: 240
Likes: 0
From: Sevierville USA
Exhaust
What would true duals sound like on a V10. Run 3inch pipes through high flow cats and Flowmaster 70 series mufflers with a crossover tube. Haven't heard of anyone trying this. Thought maybe the 70's would quieten it down a little and still allow max flow. Just a thought. Found something like this on a web site but they wasn't clear as to what they did. Check it out!
http://home.earthlink.net/~atomhart/galaxie.htm
Thanks
http://home.earthlink.net/~atomhart/galaxie.htm
Thanks
Postmaster
Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Exhaust
Besides being illegal (can't add the second cat), I think it would sound kind of "ricey"- imagine two 5-cylinder engines. IMO a split after the muffler would sound more mellow... if that's the sound you are going for.
Senior User
Joined: Feb 2002
Posts: 234
Likes: 0
From: CONNECTICRAP
Exhaust
Is it really illegal to go from one cat to two? Hmph, I did not know this. Why is that? I was also thinking about going to a true dual exhaust with basically the same type of setup. But now I'm going to need to do some more asking around about this. Thanks, Nomo, for sharing that info.
But my other question is the sound. Wouldn't a crossover tube connecting the 2 sides balance the sound of 10 cyl? I don't think it would sound like 2 5 cyl engines if it had an X or H pipe.
So my last question is.....How do I do a true dual exhaust? If I can't add another cat, then how do I seperate the left and right sides? I really like the idea of the old fashioned dual exhaust. If the only way to do it is after the cat, then I'll just keep my Gibson.
Thanks again for your help.
But my other question is the sound. Wouldn't a crossover tube connecting the 2 sides balance the sound of 10 cyl? I don't think it would sound like 2 5 cyl engines if it had an X or H pipe.
So my last question is.....How do I do a true dual exhaust? If I can't add another cat, then how do I seperate the left and right sides? I really like the idea of the old fashioned dual exhaust. If the only way to do it is after the cat, then I'll just keep my Gibson.
Thanks again for your help.
Senior User
Joined: Nov 2000
Posts: 240
Likes: 0
From: Sevierville USA
Exhaust
You know, the more I think about it the more interesting it sounds. If only there was a way of doing it without spending all the money up front. As far as the cats go, I don't have to worry about it here. Where I live, there isn't any checking of any kind. Heck, you can even remove the cat without getting caught.
Now the questions:
1 What is the difference between the "X" and the "H" crossover tubes?
2 How do you determine where they should be placed within the system?
3 What about the O2 sensor?
4 What do you do with the smog pump tube?
Help with these questions and I might take the plunge and be the guinea pig. All I am doing is looking for an excuse to change my flowmaster 40 series anyway.
Thanks
Now the questions:
1 What is the difference between the "X" and the "H" crossover tubes?
2 How do you determine where they should be placed within the system?
3 What about the O2 sensor?
4 What do you do with the smog pump tube?
Help with these questions and I might take the plunge and be the guinea pig. All I am doing is looking for an excuse to change my flowmaster 40 series anyway.
Thanks
Senior User
Joined: Nov 2000
Posts: 240
Likes: 0
From: Sevierville USA
Trending Topics
Senior User
Joined: Feb 2002
Posts: 234
Likes: 0
From: CONNECTICRAP
Exhaust
Here's what I know
1. I think the shape determines the amount of backpressure allowed in the system. H being more than X
2. The crossover should be placed in tune with the engine. There is a pulse generated by the exhaust. This pulse is bounced back to the engine by the crossover. The pulse coming out and the one going back should be equal.
3. In my friend's 99 Cobra, they simply welded the threaded ports into the new pipes in the stock location. That way, the sensors could be replaced easily as stock.
4. Never heard of it. Sorry.
Well there ya go. Time to make that appointment.
Can't wait to HEAR the results.
BTW, I finally heard my Gibson cat back from outside while my friend drove the truck up the street. WIMPY!! I was so disappointed. The temptation is mounting. Which mod first?! Oh the agony.
Good luck with your decision.
1. I think the shape determines the amount of backpressure allowed in the system. H being more than X
2. The crossover should be placed in tune with the engine. There is a pulse generated by the exhaust. This pulse is bounced back to the engine by the crossover. The pulse coming out and the one going back should be equal.
3. In my friend's 99 Cobra, they simply welded the threaded ports into the new pipes in the stock location. That way, the sensors could be replaced easily as stock.
4. Never heard of it. Sorry.
Well there ya go. Time to make that appointment.
Can't wait to HEAR the results.BTW, I finally heard my Gibson cat back from outside while my friend drove the truck up the street. WIMPY!! I was so disappointed. The temptation is mounting. Which mod first?! Oh the agony.
Good luck with your decision.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Postmaster
Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Exhaust
First, altering the emissions system is a violation of Federal law. Although, as you (and I) have experienced, not all areas are checked. 
1. The cross-over pipe is installed to balance pressure between the pipes in order to better evacuate the exhaust pulses (NOT to increase backpressure). The "X" design is better because of the angles & because of the increased common area between the pipes.
2. As was mentioned before, the ideal place is determined by calculating exhuast flow based on a number of criteria. For us common guys, I've always heard it best to install the cross-over as close to the manifolds as possible.
3. Torch a hole in the pipe & weld the O2 sensor "nut" onto it.
4. Smog pump? My truck didn't have one.
1. The cross-over pipe is installed to balance pressure between the pipes in order to better evacuate the exhaust pulses (NOT to increase backpressure). The "X" design is better because of the angles & because of the increased common area between the pipes.
2. As was mentioned before, the ideal place is determined by calculating exhuast flow based on a number of criteria. For us common guys, I've always heard it best to install the cross-over as close to the manifolds as possible.
3. Torch a hole in the pipe & weld the O2 sensor "nut" onto it.
4. Smog pump? My truck didn't have one.
Senior User
Joined: Nov 2000
Posts: 240
Likes: 0
From: Sevierville USA
Exhaust
Duh 
Maybe I should have checked before I ASSumed there was a smog pump. Ok guys, I am going to check out a few shops and see what I can find out. I'll let you know how much and whether or not I am going to play the guinea pig.
Thanks
Maybe I should have checked before I ASSumed there was a smog pump. Ok guys, I am going to check out a few shops and see what I can find out. I'll let you know how much and whether or not I am going to play the guinea pig. Thanks
Senior User
Joined: Apr 2002
Posts: 391
Likes: 1
Exhaust
[updated:LAST EDITED ON 20-Jul-02 AT 10:17 PM (EST)]An old trick for finding the cross over point for a single tube
cross over pipe.
Set up the duals
Paint the pipes for a few feet from the headers down the pipe.
Drive around in the way and places you plan to.
Find the first spot on each pipe where the paint burns off first.
Weld the tube between those spots.
-Jim
2001 E-450 Superduty Cutaway
cross over pipe.
Set up the duals
Paint the pipes for a few feet from the headers down the pipe.
Drive around in the way and places you plan to.
Find the first spot on each pipe where the paint burns off first.
Weld the tube between those spots.
-Jim
2001 E-450 Superduty Cutaway
