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Large or Small Common open area for a X pipe?

biomedtechguy

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I have a set of 7/8" primary tube TTi headers going on my Roadrunner as soon as I get my 833 back from Passon. I have the 3" diameter collector adapters, which then will feed a set of Doug's 3" electronic cutouts, then I will have a 3" diameter X pipe, which will then tie into whatever remaining part of my existing 2 1/2" Flowmaster exhaust system can be used. **My question is: does the large opening common area design or small opening common area design X pipe offer better PERFORMANCE?** I have seen the inside of both, one has a larger chamber open common area, and the other has a much smaller opening that joins the 2 pipes together. Thanks!
 
x -pipe

I believe the crosssectional area, length and shape of the cross over section is tuned for a range of rpm. The effectiveness of any exhaust design is dependent on the frequency, amplitude and density of the exhaust pulse. An engine expert knowing the specifics of your engine, header lengths, collector style & size, & exhaust length from collector to x-pipe could make a recommendation.

I can't offer that expertise.

In another brand car, I've got block hugger 1 7/8" headers, to 2.5" pipe which is 24"to the 2.5 x-pipe made by Pipes. I'm very happy with the top end performance and especially how the cabin exhaust noise has been reduced.
 
Thanks for the reply. I basically have 2 choices, one where the 2 3" dia. pipes "kiss" with about a 2 3/4" hole joining the 2 together, and the other being more like the MagnaFlow type where there is a moulded X shape to the chamber, but the opening between the 2 is much larger.
 
Does the manufacturer have a tech support department? I'm thinking they should be able to give you an idea what the difference is.
 
I am going to talk to TTi and MagnaFlow today to get their perspectives. I just wanted to see what my B-body brethren had to say. Thanks
 
Not suprisingly, the manufacturers that make the small common chamber volume say that is the best, while the manufacturers that make the larger volume common area say that gives the best flow....I would still like input from this forum, but unless I am convinced otherwise, it looks like I will be using the larger opening/chamber volume style. Thanks again, I will be checking back for additional posts.
 
Bump for some weekend readers. Any input? See sample pix Screenshot_2015-06-20-14-06-05-1.jpgScreenshot_2015-06-20-14-08-13-1.jpg](not identical to the ones I am talking about, but close enough)
 
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I have a 3.5" Drgas X pipe set up - never used if you're interested...Nice stuff but might be too big for your set up.
 
Thanks. 3" diameter is what I am doing. Still hoping for some additional input on design difference and how it may affect performance.
 
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