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2.5 " exhaust piping vs 3 "

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Old 11-17-2003, 07:32 PM
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Default 2.5 " exhaust piping vs 3 "

What size exhaust piping works best with a LS / Turbo setup?

2.5 " or 3 "..
Old 11-17-2003, 07:33 PM
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Default Re: 2.5 " exhaust piping vs 3 " (5thgenh4tch)

The bigger the better on any turbo. Turbos spin off pressure differential from one side to the other, less restriction on the exhaust side will allow the turbine to spin up sooner and make more power.
Old 11-17-2003, 07:34 PM
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Default Re: 2.5 " exhaust piping vs 3 " (5thgenh4tch)

Everyone seems to have gotten great gains going from 2.5 to 3. I am going to try a 3.5 this week.
Old 11-17-2003, 07:39 PM
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Default Re: 2.5 " exhaust piping vs 3 " (RedTegLS)

My new car is getting a 3" dp and I'm going to attempt 4" exhaust.
Old 11-18-2003, 12:44 AM
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Default Re: 2.5 " exhaust piping vs 3 " (5thgenh4tch)

I am going to be going with a full custom 2.5 inch exhaust. I don't plan on making much more than 200 whp on my d16z6 so I really have no need to go any bigger.
Old 11-18-2003, 04:26 AM
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Default Re: 2.5 " exhaust piping vs 3 " (Jared)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">My new car is getting a 3" dp and I'm going to attempt 4" exhaust.</TD></TR></TABLE>
Are you just trying to out do me? Hahahahah J/K. I just figured 3" is the norm so 3.5 might be just that much better. I am not sure if 4 will fit?
Old 11-18-2003, 06:45 AM
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Default Re: 2.5 " exhaust piping vs 3 " (beerbongskickass)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beerbongskickass &raquo;</TD></TR><TR><TD CLASS="quote">I am going to be going with a full custom 2.5 inch exhaust. I don't plan on making much more than 200 whp on my d16z6 so I really have no need to go any bigger.</TD></TR></TABLE>

So if your going to be making less than 200 whp, is 3 " overkill?
Old 11-18-2003, 07:10 AM
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Default Re: 2.5 " exhaust piping vs 3 " (5thgenh4tch)

3.5" downpipe to a 4" with a side downturn exit in front of the pass. rear wheel.
Hopefully it won't be too loud, planning a 4" bullet muffler for a reasonator and a 4" Dynomax Ultraflow 6" can for a muffler.
Old 11-18-2003, 07:21 AM
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I was always under the impression that no matter how many HP you planning on, if you are going Turbo the less back pressure the better!
Old 11-18-2003, 07:34 AM
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Default Re: (RedTegLS)

I wonder if 5 inch downpipe will fit
Old 11-18-2003, 08:59 AM
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2.5" or bigger most likely your AC and PS is gone. thats why most people in the sub 300whp range stick w/ 2.5". it has enough flow and lacks enough back pressure for the turbo to spool nicely but isnt over kill. 2.5" is fine for any daily driving turbo....if you want the best combo for a daily driver sub 300whp car i would do a 2.5" DP (allows keeping a/c and ps easy) and then do 3" from the cat back...w/ a high flow cat, or a hollowed out cat.....either or...
Old 11-18-2003, 09:18 AM
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why even run a dp..
Old 11-18-2003, 11:02 AM
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Default Re: (30psi Teg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 30psi Teg &raquo;</TD></TR><TR><TD CLASS="quote">why even run a dp..</TD></TR></TABLE>
yeah lol what would happen if you did this other than heating up your bay?
Old 11-18-2003, 07:08 PM
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Default Re: (nevin)

Thanks guys for the replies.
Old 05-21-2004, 10:54 PM
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Default Re: (j boy)

sorry for bringing up an old thread, just wanted to get more opinions..
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