Running 3" exhaust under the rear susp.

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Old Jan 10, 2008 | 09:24 PM
  #1  
a1320honda's Avatar
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Default Running 3" exhaust under the rear susp.

So im just tryin to find pics and info on doin this. I wanna run a real simple exhaust setup thats gonna be V-Band'd. But i wanna run it under the rear suspension. I know its gonna decrease ground clearance but is it really that bad? Anyonewith pics or info on this, please post up.

For reference

Hope its ok to use the pic, if not, ill take it down.
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Old Jan 10, 2008 | 10:19 PM
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Default Re: Running 3" exhaust under the rear susp. (a1320honda)

how would it be bad? as in scraping? is your car gonna be street driven?
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Old Jan 11, 2008 | 01:16 AM
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Default Re: Running 3" exhaust under the rear susp. (a1320honda)

yes its bad if it scrapes and gets dented up
yes its good because there are less bends and it will make more power

my evo as like all evos have the exhaust routed under the suspension. there are almost no bends and there is a ton of clearance

but will all the hondas i see this done i think it hangs way to low for a street driver lower honda
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Old Jan 11, 2008 | 04:07 AM
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"FU 402" ?

You didn't really say what this car was used for. For a DD it's not a good idea IMO.
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Old Jan 11, 2008 | 05:49 AM
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Default Re: (2point2)

Mine goes under the gas tank. For a race car it's fine, but i wouldn't do it on a street car. I have about 3-4" of ground clearance with 4" exhaust going under the tank, but i dented the tank up a little too.
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Old Jan 11, 2008 | 08:24 AM
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From: stixs,ct
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ill be doing the saem thing....look into oval exhaust tubing gives the same cfm as a 3IN.. http://www.drgas.com/store/home.php?cat=8



give a good refrence to size from circle to oval....this is waht my setup will be gogin as..
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Old Jan 11, 2008 | 08:29 AM
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^damn, now that's a good idea!

anyone know if using oval tubing over round would affect exhaust velocity?
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Old Jan 11, 2008 | 08:36 AM
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Default Re: (full Circling)

As long as the cross sectional area doesnt change or change significantly in a short distance there will be *negligible* affects on velocity.
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Old Jan 11, 2008 | 09:55 AM
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Default Re: (full Circling)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by full Circling &raquo;</TD></TR><TR><TD CLASS="quote">^damn, now that's a good idea!

anyone know if using oval tubing over round would affect exhaust velocity?</TD></TR></TABLE>

youd want the whole length of tubing to be oval though, otherwise youd have a slight bottleneck when making the transition from round to oval.
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Old Jan 11, 2008 | 10:04 AM
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what would you do then as far as the flange from the circular downpipe to the oval tubing?
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Old Jan 11, 2008 | 10:09 AM
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Default Re: (usdm97DC4)

Scroll down, its a 3" on my 97 civic hb daily driver
https://honda-tech.com/zerothre...ge=11
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Old Jan 11, 2008 | 11:50 AM
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Default Re: (quicksilver1689)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quicksilver1689 &raquo;</TD></TR><TR><TD CLASS="quote">what would you do then as far as the flange from the circular downpipe to the oval tubing?</TD></TR></TABLE>

Burnsstainless makes transitions. I'm using two on my setup.
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Old Jan 11, 2008 | 12:11 PM
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Default Re: (2point2)

This is my hatch with an older 4" SS exhaust setup. Clearance was not bad, but It was only lowered about 1.25" .

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Old Jan 14, 2008 | 01:55 AM
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Default Re: Running 3" exhaust under the rear susp. (a1320honda)

you guys are queers.

I ran it right under the gas tank.





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Old Jan 14, 2008 | 03:10 AM
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Default Re: Running 3" exhaust under the rear susp. (integlspwr2k)

/\/\ That looks fun to drive on the street
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Old Jan 14, 2008 | 03:39 AM
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Default Re: Running 3" exhaust under the rear susp. (4thgenhtch)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4thgenhtch &raquo;</TD></TR><TR><TD CLASS="quote">/\/\ That looks fun to drive on the street </TD></TR></TABLE>

it was actually driven every day to and from work.
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Old Jan 14, 2008 | 04:18 AM
  #17  
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Default Re: Running 3" exhaust under the rear susp. (integlspwr2k)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integlspwr2k &raquo;</TD></TR><TR><TD CLASS="quote">you guys are queers.

I ran it right under the gas tank.

</TD></TR></TABLE>

HAHA no way I could get away with that around here. That's like less then an inch of clearance.
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Old Jan 14, 2008 | 04:32 AM
  #18  
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Default Re: Running 3" exhaust under the rear susp. (White Smoke)

haha x2

HI Roads must be nice
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Old Jan 15, 2008 | 12:49 AM
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Default Re: Running 3" exhaust under the rear susp. (4thgenhtch)

it helps alot if you have 19kg/mm and 17kg/mm. doesn't squat for a damn.



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Old Jan 15, 2008 | 04:01 AM
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If you get were the lowest point is where the rear subframe is at then it is not such a big deal. Because, if you hit the bump straight, then both wheels will go over it and it should clear. Dips on the other hand, are a whole different story
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Old Jan 15, 2008 | 04:05 AM
  #21  
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Default Re: (Riake)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Riake &raquo;</TD></TR><TR><TD CLASS="quote">If you get were the lowest point is where the rear subframe is at then it is not such a big deal. Because, if you hit the bump straight, then both wheels will go over it and it should clear. Dips on the other hand, are a whole different story</TD></TR></TABLE>

exactly. it hangs a little bit lower than the subframe which is more than enough clearance for most places.
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Old Jan 23, 2008 | 06:25 PM
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wondering if anyone else has done under the gas tank .....this is exactly what i wanta do

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Old Jan 23, 2008 | 09:40 PM
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Default Re: (punkracer)

i ran mine unther the gas tank cause i wanted it to be as straight and free flowing as possible. it clears good enough for me. if i get it up on the lift ill take a pic and post it here.
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