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      09-16-2019, 12:32 AM   #1
p.mf10
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Downpipes Suggestions

Looking at getting catless downpipes and midpipes for my F90 preferably in 3.5" size.
My question is does the size 3" vs 3.5" make a big difference (sound wise) ?
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      09-19-2019, 09:42 AM   #2
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Keller Performance Gen 2 downpipes are 3.5 inch with standard titanium ceracote coating, other downpipes taper to under 3 inches in some places and hurt the performance, but no one talks about it, but it cost cheaper. Let me know if you have any other questions. Thank you !
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      09-19-2019, 11:32 AM   #3
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Not much in the sound. More in the performance.
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      10-20-2019, 05:42 PM   #4
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Quote:
Originally Posted by KellerPerformance View Post
Keller Performance Gen 2 downpipes are 3.5 inch with standard titanium ceracote coating, other downpipes taper to under 3 inches in some places and hurt the performance, but no one talks about it, but it cost cheaper. Let me know if you have any other questions. Thank you !
Downpipe is primary and midpipe is secondary?
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      10-22-2019, 10:03 AM   #5
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Quote:
Originally Posted by Bmw.mozambique View Post
Downpipe is primary and midpipe is secondary?
Yes
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      10-22-2019, 06:25 PM   #6
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Im very interested in dyno results showing performance gains by going with 3.5" downpipes vs 3.0"
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      10-22-2019, 07:00 PM   #7
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Quote:
Originally Posted by mike@x-ph.com View Post
Im very interested in dyno results showing performance gains by going with 3.5" downpipes vs 3.0"
agreed. I wanna see facts not just its better cause its bigger (yes that's what she said...)
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      10-22-2019, 10:43 PM   #8
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Quote:
Originally Posted by yellowssm View Post
agreed. I wanna see facts not just its better cause its bigger (yes that's what she said...)
I think that 3” is more than enough
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      10-23-2019, 02:04 AM   #9
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KELLER!
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      10-23-2019, 02:40 AM   #10
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keller all the way.
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