open down pipe or full exhaust?? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 12 Old 06-26-2010, 02:03 PM Thread Starter
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open down pipe or full exhaust??

What are the advantages/disadvatages to running full exhaust as to open downpipe other then the niose?
Does the turbos spool faster and have less stress on them as opposed to a complete exhaust car ? Thanks for your replies-

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post #2 of 12 Old 06-27-2010, 04:31 AM
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Think of your engine as an air pump. Air in air out + fuel = horsepower. The less restrictions the better. Open downpipe would flow air better than full exhaust. As long as the turbos flow enough and you have enough fuel, it should make more power on open downpipe.

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post #3 of 12 Old 06-27-2010, 05:32 AM
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One downside to running an open downpipe is that if you have a headgasket let go on the big end you will wet the tires down.

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post #4 of 12 Old 06-27-2010, 09:53 AM Thread Starter
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Thats true, a bit of saftey concern to take into consideration here. thanks 95gtcpe
post #5 of 12 Old 06-27-2010, 12:51 PM
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I went open dp from Flowmaster American Thunder catback and picked up a few psi iirc, faster spool, much more power. No et's or dyno #'s for more verifiable evidence, but the seat of the pants meter was all the verifying I needed. Otoh, chambered Flows suck for turbos, so I'm sure the results wouldn't have been as dramatic with a straight thru catback.

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post #6 of 12 Old 06-27-2010, 02:59 PM
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I am just running a straight pipe off the down pipe and through a bullet muffler with a turn down. Its a little loud but not restrictive and moves the exhaust from under the rear tires.
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post #7 of 12 Old 06-27-2010, 05:44 PM
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I ran my old car 3 inch down pipe to a 2 1/2inch y and 2 1/2 cat back, just removed my mufflers for straight pipes. Sounded good fast spool too.
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post #8 of 12 Old 06-27-2010, 07:20 PM
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Open dP = not street legal... Cat back = street legal just buy some pypes straight thru design
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post #9 of 12 Old 06-27-2010, 09:36 PM Thread Starter
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what if I pull the mufflers from the system and just let the downpipes run underneith. with this help the turbos spool faster?
post #10 of 12 Old 06-28-2010, 06:11 PM
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While I was on the dyno we did a run with the cutout opened and closed and it gained 45hp to the wheels with the cutout opened.



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post #11 of 12 Old 07-02-2010, 01:23 PM
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In most cases you will pick up power but if you drive the car much, the noise will get annoying. I drove my old 5.0 around for a few days and that was enough for me to put a ypipe kit on it to run it through the catback. On our kits, we have a cutout in the ypipe section so that you can open the exhaust up if you need but run it quiet if you drive it much. If you have another kit, you can just weld in a y section to run a cutout as well, just what I prefer and most seem to like it as well
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post #12 of 12 Old 07-03-2010, 01:54 PM Thread Starter
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cool, I think Im going to do a custom 3" y pipe
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