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Unread 01-01-2010, 02:40 PM   #1
sundownbrown
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Best exhaust for a straight 6 with headers?

My jeep has a straight 6 with headers. There are 3 pipes on each one of the headers to where there is dual exhaust. Would 2 flowmasters sound good, or should I combine both exhaust pipes and go with one muffler? What do yall think?

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Unread 01-01-2010, 03:56 PM   #2
PlatinumNiner
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you cant do a true dual on a 4.0 You go 1 pipe all the way out. 2.5" and a muffler of your choice. Personally i think flowmasters sound terrible on the 4.0 I love the banks and gibson mufflers.
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Unread 01-01-2010, 04:02 PM   #3
sundownbrown
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my engine is a straight 6 258 cubic inch enigne. I'm not sure what litre it is.
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Unread 01-01-2010, 04:04 PM   #4
PlatinumNiner
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4.2 either way its the I6 single 2.5" exhaust is the way to go. The muffler is of course personal choice.
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Unread 01-01-2010, 05:22 PM   #5
HighFive
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Do the dual exhaust with two flowmasters and you will love the sound. Sounds like a v8! We just did dual exhaust with two flowmaster originals and sounds tough.

Here's some vids to look at off youtube:
YouTube - 258 inline 6 exhaust
An excuse to show off homemade dual exhaust, cam, - Car Videos on StreetFire
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Unread 01-01-2010, 05:46 PM   #6
gojeepin
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Pipe diameter is the most important component to sound. A single flowmaster 40 series and 2.5" pipe is a good sound.
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Unread 01-01-2010, 09:03 PM   #7
sundownbrown
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Highfive,

That exhaust sounds freaking awesome. That isw what I'm going to do. Thanks
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Unread 01-01-2010, 09:43 PM   #8
HighFive
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Quote:
Originally Posted by sundownbrown View Post
Highfive,

That exhaust sounds freaking awesome. That isw what I'm going to do. Thanks
BTW Those are not my exhausts, just ones i found on youtube. But mine sounds similar to both of them. Good luck!
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Unread 01-01-2010, 09:55 PM   #9
sundownbrown
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Highfive,

I think that is what im going to do. I wanted to just striaght pipe it with no mufflers, but im not sure how that will sound. What do you think?
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Unread 01-01-2010, 10:01 PM   #10
Marctwayne
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Quote:
Originally Posted by sundownbrown View Post
Highfive,

I think that is what im going to do. I wanted to just striaght pipe it with no mufflers, but im not sure how that will sound. What do you think?
It will sound loud! you will get fed up with it and redo it. To boot you will probably have a few tickets to contend with. Make it sound good not cheep!
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Unread 01-01-2010, 10:10 PM   #11
HighFive
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People on here say it sounds like crap with a single pipe. I would think it would be to loud and annoying. I would definately put some kind of mufflers on there. Theres alot of selections. I found a deal on CL for two flowmasters for 75$. So we coundn't turn that down.
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Unread 01-01-2010, 10:36 PM   #12
sundownbrown
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thanks for all the input- im gonna go with the flowmasters.
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Unread 01-01-2010, 10:48 PM   #13
PlatinumNiner
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I put a flowmaster 40 on my XJ sounded terrible. 2.5" pipe all the way out had no cat at the time. Sounded like a honda at anything over 3000 RPM. Removed it right away and went magnaflow. That was a little better but still wasnt happy. Removed that right away and went gibson. Never looked back.
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Unread 01-02-2010, 01:40 PM   #14
sundownbrown
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Anybody else?
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Unread 01-02-2010, 03:45 PM   #15
gmakra
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If you research the subject matter you will find that the dual outlet is designed to go into a Y pipe and exit the Jeep as one common pipe. If you go dual exhaust you will probably lose mileage and maybe some performance due to the scavenging.

Also the other issue is that it will be a sever PIA to plumb that exhaust piping.
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