2.5 vs. 3inch downpipe - D-series.org

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Old 11-20-2008, 04:09 PM   #1 (permalink)
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Default 2.5 vs. 3inch downpipe

I see quite a few 3 inch downpipes. What power numbers would you see the benefit of 3 inch? 250hp or 300hp? Are there any guidelines to picking the size of your downpipe?
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Old 11-20-2008, 04:15 PM   #2 (permalink)
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well while its a given that a 3 inch can flow more then a 2.5 you would be surprised at how much power can be made on a 2.5, a good example i can give you is my old CRX , it had a DSM turbo and they use a O2 housing and stock they are only around 1-7/8s inch opening i had mine ported out to close to 2 inch, then my exhaust was 2.5 the rest of the way back, and i made 305 whp and 265 tq, and ran mid 11s in the 1/4, many people was shocked when they heard and saw i did not have a 3 inch exhaust system.
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Old 11-20-2008, 04:16 PM   #3 (permalink)
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the biggest guide line is space, but 3 in will do more than 300. if you have the space go for it by looking at you mods it seems you would benefit from the 3in
EDIT: in your mods list you spelled xenocron wrong
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Old 11-20-2008, 04:19 PM   #4 (permalink)
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Quote:
Originally Posted by Boosted91 View Post
well while its a given that a 3 inch can flow more then a 2.5 you would be surprised at how much power can be made on a 2.5, a good example i can give you is my old CRX , it had a DSM turbo and they use a O2 housing and stock they are only around 1-7/8s inch opening i had mine ported out to close to 2 inch, then my exhaust was 2.5 the rest of the way back, and i made 305 whp and 265 tq, and ran mid 11s in the 1/4, many people was shocked when they heard and saw i did not have a 3 inch exhaust system.
Thanks a ton! Thats exactly what i wanted to know. I think im gonna keep it simple with 2.5. Maybe go 3inch from the dp back?
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Old 11-20-2008, 04:21 PM   #5 (permalink)
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Thanks a ton! Thats exactly what i wanted to know. I think im gonna keep it simple with 2.5. Maybe go 3inch from the dp back?
You may as well do it all in 3"
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Old 11-20-2008, 04:23 PM   #6 (permalink)
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if space allows it then you wont loose by doing it all 3 , but if you already have a 2.5 or space is tight then yeah you can go 2.5 to 3 , you just never want to go backwards like 3 to 2.5 .
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Old 11-20-2008, 04:24 PM   #7 (permalink)
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Originally Posted by GO-AUTOWORKS View Post
You may as well do it all in 3"
Its gonna be atight fit in my del sol, with p/s and ac. And how much more power are you gonna make, and Im sure the 3inch is gonna affect the drivability some.
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Old 11-20-2008, 04:27 PM   #8 (permalink)
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bigger dp will also help your turbo to spool up quicker id go 3" if your going for anything 300+whp
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Old 11-20-2008, 04:30 PM   #9 (permalink)
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Hmm, good to know. Thank yous
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Old 11-20-2008, 04:33 PM   #10 (permalink)
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a/c; 3" probably wont work with compressor clearance for the A/C so you will more than likely have to go 2.5"-3"
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