Yell0w

Hi, i have a stock b16 eg with a 3 inch exhaust. It came with the car when i bought it and i was wondering if i should keep it or down grade it? Plus the guy did a shitty job welding the exhaust to the header and it leaks there like crazy.

speedooo

3" is what you should be using on a boosted b series...try downgrading to a 2.5"

satinsol

in my opinion..yea too big.
if you like it, keep it.
if it leaks and sounds like ****.
then redo it the right way.

Yell0w

should i get a custom exhaust from a shop or should i buy a full back?

speedooo

personally i would buy a full catback

turb0teg

it's pretty cheap to buy an exhaust from ebay now... my buddy got a setup for his 240sx and it was really nice from ebay.

2.25" for a stock b16 at the most
3" if you go turbo

jdm_BlaZe

Just go open header,b16 is just slow wif exhaust.

Luserkid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdm_BlaZe &raquo;</TD></TR><TR><TD CLASS="quote">Just go open header,b16 is just slow wif exhaust..... and "wifout" </TD></TR></TABLE>


Fixed for you

slacks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Yell0w &raquo;</TD></TR><TR><TD CLASS="quote">should i get a custom exhaust from a shop or should i buy a full back?
</TD></TR></TABLE>

I would go for a full catback too. the exhaust my car came with was welded as one piece and a nightmare to replace it with my ebay exhaust.

spock_rocker

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdm_BlaZe &raquo;</TD></TR><TR><TD CLASS="quote">Just go open header,b16 is just slow wif exhaust. </TD></TR></TABLE>

i love shitty advice!!

neoc03

I'm betting it was boosted before you bought it. Just get a cat-back system. If the 3" is still in good condition LMK I need it.

oneludesol

fix the leaks and keep the 3" pipe, if it is too loud for you, slap a universal apexi ws2 on that bad boy and be done...

LuckyToBeBC

Ya 3 in is to big for a stock b16 3in is usually ran on boosted b16's

Yell0w

does it hurt performance? I don't think so because the header is providing the back pressure. even if the exhaust is too big the header limits the amount of exhaust that is released. if i keep the 3 inch exhaust is there a test pipe or thing that i can attach the exhaust to my header? Or do i have to hire someone to weld it for me??

Hardedge

I would just throw on an APEXi WSII. I believe the piping on it is 60 mm, which is roughly 2.25" (around what most people are suggesting for an NA B16A). Three inches is excessive relative to the size and frequency of a B16's exhaust pulses. Plus, it probably sounds like ****, especially when coupled with a straight-through.

laocivic

i wouldn't go any bigger than 2.5 in on a n/a B series. if u dont care then just get the welds fixed. i always like a full cat back. its just so much easier that way.

SiYouLater

You need 2.25" for a stock B16.

1krebs1

same thing he said its not a diesel if any thing your losing power cuz OOOO back pressure

GGcivicEG

Id so go for it if you like all top end and nooo bottum end at all, I go with what every one else though 2.5 cat back.

missingboost

i would def just go with a 2.5.. anyways your motor is stock.... i'm in the same boat with you right there.

97Ej6mike

2.25 - 2.5 is plenty for an N/A B-series.

Yell0w

K thx for all the advice that everyone has given. When i do get a 2.23-2.5 exhaust should i also up grade the header? what brand and what kind of test pipe or cat size would i need?

devney

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Yell0w &raquo;</TD></TR><TR><TD CLASS="quote">K thx for all the advice that everyone has given. When i do get a 2.23-2.5 exhaust should i also up grade the header? what brand and what kind of test pipe or cat size would i need?</TD></TR></TABLE>

Everybody is going to say something different about brand. You really can't get a good answer because there's so many opinions. You could purchase a header if you want to, it's really up to you. Could give you some gains in combination with your new exhaust system. Cat size just depends on how big your exhaust piping will be. Just match it.

King V

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1krebs1 &raquo;</TD></TR><TR><TD CLASS="quote">same thing he said its not a diesel if any thing your losing power cuz OOOO back pressure</TD></TR></TABLE>


You lose power not from a loss in backpressure, but a loss in laminar flow which can be caused by too big or too small a pipe. The factory 2.25 exhaust was picked because it offers the best laminar flow and silencing characteristics that they needed. It's not really "backpressure"that makes an exhaust work, its how efficiently the exhaust pulses/gases carry each other out the exhaust, and thats related to the diameter/length/amount of bends the system has.

When a fluid flows thru a pipe, you get what they call a boundary layer right at the surface of the pipe which is a small layer of turbulence/mayhem. That acts as a "lubricant" for the rest of the gas/fluid to slide over. Now if you make the fluid move through the pipe faster or increase the volume through the pipe, the boundary layer gets "taller" and sticks into the moving stream more, effectively decreasing the diameter of the pipe. That's why performance exhausts are generally bigger and straighter than OEM systems because they run on the assumption thet the engine you're putting it on has had its performance/output increased, requiring more room in the pipe.


Modified by King V at 11:27 AM 1/26/2008

Rok_Stok

60mm catback. I bet you have no torque right now. The velocity of the exhaust will increase alot with smaller piping, because there isn't enough coming out to fill the 3" piping. Sounds right, that was fresh out of my @$$.

A'pexi, RS*R, Fujistubo...