3.5 inch downpipe into 3 inch exhaust, will it bottleneck?
09-07-2005, 11:18 AM
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3.5 inch downpipe into 3 inch exhaust, will it bottleneck?
i have a 3 inch exhaust for my car and i have the opportunity to buy a 3.5 inch downpipe with a turbo for a good deal and i was curious if it would create a bottleneck effect or if it wouldnt matter at all, let me know, thanks vernon
09-07-2005, 11:22 AM
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09-07-2005, 03:18 PM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (wantboost)
It'll definitely make less power than with a 3.5" catback, but 3.5" DP to 3" catback will make more power than 3" all the way back 
09-07-2005, 04:06 PM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (Muckman)
if i were you i'd order one of the conversion test pipes from kteller.com for 3.5" to 3" (i think they make them) and then weld on a 3.5" exhaust cutout (about 25 bucks from summit racing) onto the conversion pipe and youve just solved the bottleneck problem.
09-08-2005, 07:08 AM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (Muckman)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman »</TD></TR><TR><TD CLASS="quote">Do you think 3.5 DP > 3" exhaust would have more back pressure than 3" DP > 3.5" exhaust?
Modified by Muckman at 8:35 PM 9/7/2005</TD></TR></TABLE>
yes, because more of the piping is 3" vs 3.5"
i'll be using a 4" exhaust system eventually. i just need to get my fab guy to look at it, but for now its 3" open dp till i can get my 4" made
Modified by Muckman at 8:35 PM 9/7/2005</TD></TR></TABLE>
yes, because more of the piping is 3" vs 3.5"
i'll be using a 4" exhaust system eventually. i just need to get my fab guy to look at it, but for now its 3" open dp till i can get my 4" made
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09-08-2005, 07:17 AM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (wantboost)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wantboost »</TD></TR><TR><TD CLASS="quote">
yes, because more of the piping is 3" vs 3.5"
i'll be using a 4" exhaust system eventually. i just need to get my fab guy to look at it, but for now its 3" open dp till i can get my 4" made</TD></TR></TABLE>
open downpipe in 3" will probally still make more power than a full 4" exhaust.
the noise just really sucks
yes, because more of the piping is 3" vs 3.5"
i'll be using a 4" exhaust system eventually. i just need to get my fab guy to look at it, but for now its 3" open dp till i can get my 4" made</TD></TR></TABLE>
open downpipe in 3" will probally still make more power than a full 4" exhaust.
the noise just really sucks
09-08-2005, 07:29 AM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (m R g S r)
yea, but my exhaust system is just a straight pipe, no cat, resonator or muffler
srt4 style y0!
srt4 style y0!
09-08-2005, 11:21 AM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (wantboost)
well i've got a good deal on a 3.5 inch downpipe but i've already got a 3 inch exhaust that i just bought and i dont want to get a 3.5 inch exhaust.
i just wanted to know if it would create a bottleneck effect or not.
i just wanted to know if it would create a bottleneck effect or not.
09-09-2005, 07:38 PM
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Re: 3.5 inch downpipe into 3 inch exhaust, will it bottleneck? (B16Civic93)
it will flow a little worse than having a 3" DP with a 3" exhaust just because of the turbulance caused by the transition... if you get a nice slow conversion peice like someone was recomending the turbulance wouldent be so bad, but one of those would probably cost enough to make the "good deal" on the downpipe not worth it.
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