Best size exhaust for a fairly stock b16 w/ intake and headers.

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12-08-2003, 09:58 PM

trooper0641

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Best size exhaust for a fairly stock b16 w/ intake and headers.

I was planning to go with the jdm dc 4-1 2.5" header with a 2.5 high flow cat and a 2.5 es oval exhaust...im wondering if that'll give me more power than a 2" or a 2.25" setup... any pros and cons about this 2.5 setup against the 2" and the 2.25"s?

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12-08-2003, 10:01 PM

Mr Hammond

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (trooper0641)

Yes. None.

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12-08-2003, 10:09 PM

Kusai.Nihonjin.Desu

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (Mr Milano)

I'm not a physicist by anymeans, but I think 2.5" and bigger is better for the turbo'ed. The mild 4 cylinder would be ok with 2"-2.25".

But then again, I'm sure someone will say otherwise.

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12-09-2003, 08:43 AM

trooper0641

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (Nihonjin)

Is it better to go with a 2.5 instead of a 2" or a 2.25 on a stock b16?

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12-09-2003, 09:39 AM

Grimm

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (trooper0641)

2.25"-2.5" 3" if going FI...

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12-09-2003, 07:29 PM

trooper0641

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (trooper0641)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by trooper0641 »</TD></TR><TR><TD CLASS="quote">Is it better to go with a 2.5 instead of a 2" or a 2.25 on a stock b16?</TD></TR></TABLE>

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12-09-2003, 08:10 PM

trooper0641

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (trooper0641)

so im guessing...using a 2.5" cat/piping/exhaust is too big for a stock b16?

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12-09-2003, 08:31 PM

JMod

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (trooper0641)

I'd like to know this as well...

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12-09-2003, 08:34 PM

dantastic

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i went from 2.25" custom bent piping to a 2.1" cat-back. it made the powerband much smoother, much better power down low. no appreciable loss up high. made drivability 10x better. so imo, 2.1" mandrel > 2.25" custom, which i can only assume is better than a 2.5" setup. keep in mind, this is for a daily driver. if u plan on keeping the motor above 5k all day, i'd say go for a 2.5" system.

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12-09-2003, 08:51 PM

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JMod

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Re: (dantastic)

Yea, on my del sol, the previous owner got custom 2.5" catback piping put on it, and this is on the stock D15B7 motor. It sounds nice, but it definetly feels like it only really makes any extra power when i'm above 4.5k. I'm planning on doing either a b20 or a b18c swap in January, should I just leave the 2.5" piping for the swap? Or would 2.25" be better suited to either of those motors. I know its way too big for my current setup, but its not worth it to change it out right now.

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12-10-2003, 06:28 AM

#11

trooper0641

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Re: (dantastic)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dantastic »</TD></TR><TR><TD CLASS="quote">i went from 2.25" custom bent piping to a 2.1" cat-back. it made the powerband much smoother, much better power down low. no appreciable loss up high. made drivability 10x better. so imo, 2.1" mandrel > 2.25" custom, which i can only assume is better than a 2.5" setup. keep in mind, this is for a daily driver. if u plan on keeping the motor above 5k all day, i'd say go for a 2.5" system.</TD></TR></TABLE> Good stuff...thats what i thought too

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12-10-2003, 06:40 AM

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Mr Hammond

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Re: (dantastic)

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12-10-2003, 06:44 AM

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SOHC_MShue

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Re: (BucsJosh)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BucsJosh »</TD></TR><TR><TD CLASS="quote">Yea, on my del sol, the previous owner got custom 2.5" catback piping put on it, and this is on the stock D15B7 motor. It sounds nice, but it definetly feels like it only really makes any extra power when i'm above 4.5k. I'm planning on doing either a b20 or a b18c swap in January, should I just leave the 2.5" piping for the swap? Or would 2.25" be better suited to either of those motors. I know its way too big for my current setup, but its not worth it to change it out right now.</TD></TR></TABLE>
I'd probably just save that piping for the swap. It won't be a bad idea if you plan on doing any kind of heavy modding to the b swap.

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12-11-2003, 10:10 AM

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Mr Hammond

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (Gumtape_Deathmatch)

If I here any more of this don't go to 2.5" you'll loose TQ i'm gonna puke. Can we please stop spreading such misinformation. How many people here have dyno's to proove this old hot rod "backpressure" bullshit? I doubt many. Also if you think anything larger then 2.5" is to much for a built all motor car, maybe you should do a little more reasearch.

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12-11-2003, 10:11 AM

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D16OnTop

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2 1/4'' should be good

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12-11-2003, 10:17 AM

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SOHC_MShue

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (Mr Milano)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano »</TD></TR><TR><TD CLASS="quote">If I here any more of this don't go to 2.5" you'll loose TQ i'm gonna puke. Can we please stop spreading such misinformation. How many people here have dyno's to proove this old hot rod "backpressure" bullshit? I doubt many. Also if you think anything larger then 2.5" is to much for a built all motor car, maybe you should do a little more reasearch.</TD></TR></TABLE>
the reason 2.25" is better is not "backpressure", but it is exhaust velocity. With 2.5" piping unless the motor is fairly built the 2.25" piping will offer better velocity exhaust velocity and a decent amount of airflow. 2.5" is overkill and will kill your low end torque unless you've got the power to back it up.

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12-11-2003, 10:19 AM

#17

Mr Hammond

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (SOHC_MShue)

It's funny you say that. Are you one of the people that has no proof of this? Sure didn't kill mine that's for SURE. If what you say is true, why not use 2" piping with a high flow resonator and muffler? I mean after all it's only a 1.6L right?

I have used stock 2", ITR 2 1/4", JDM 60mm and 2.5". Judging by my dyno results, I'll keep the later of the bunch. Oh yeah stock internal too for now.

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12-11-2003, 10:29 AM

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Mag00n

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Re: Best size exhaust for a fairly stock b16 w/ intake and headers. (Mr Milano)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano »</TD></TR><TR><TD CLASS="quote">It's funny you say that. Are you one of the people that has no proof of this? Sure didn't kill mine that's for SURE. If what you say is true, why not use 2" piping with a high flow resonator and muffler? I mean after all it's only a 1.6L right?

I have used stock 2", ITR 2 1/4", JDM 60mm and 2.5". Judging by my dyno results, I'll keep the later of the bunch. Oh yeah stock internal too for now.</TD></TR></TABLE>

Same here. I went from 2.25 to 2.5" and I LOVE my 2.5". This is on a b16 del sol with I/E. I did not feel any loss down low and the thing pulls NOITICEABLY harder up top.