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post #26 of 48 Old 11-27-2012, 06:18 PM
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Re: Want to build a custom exhaust? Read this first!

I'm glad I saw this, I was going to make a custom exhaust for my Tiburon. Thanks for the help!
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post #27 of 48 Old 02-19-2013, 10:59 AM
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Re: Want to build a custom exhaust? Read this first!

Nice thread!
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post #28 of 48 Old 07-02-2013, 05:02 PM
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Re: Want to build a custom exhaust? Read this first!

This has been very informative... I think I'm going to grab a Borla or an Ark for my 08 SE
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post #29 of 48 Old 08-10-2013, 12:57 PM
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Smile Re: Want to build a custom exhaust? Read this first!

... very informative thanks for the tips..
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post #30 of 48 Old 08-11-2013, 01:51 AM
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Re: Want to build a custom exhaust? Read this first!

I found this very informative too but some clarification should be made regarding pipe sizing. According to some info I found by Summit Racing, exhaust pipe is measured by OD rather than ID. So a 2.5" exhaust pipe is really not 2.5" ID. Any thoughs on this?
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post #31 of 48 Old 08-11-2013, 06:09 PM Thread Starter
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Re: Want to build a custom exhaust? Read this first!

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Originally Posted by siman View Post
I found this very informative too but some clarification should be made regarding pipe sizing. According to some info I found by Summit Racing, exhaust pipe is measured by OD rather than ID. So a 2.5" exhaust pipe is really not 2.5" ID. Any thoughs on this?
Some pipe is measured by OD, some by ID. They usually say which. At any rate, 2.5" ID vs OD won't make a noticeable difference.


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post #32 of 48 Old 08-13-2013, 04:47 PM
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Re: Want to build a custom exhaust? Read this first!

Quote:
Originally Posted by Spartacus View Post
Some pipe is measured by OD, some by ID. They usually say which. At any rate, 2.5" ID vs OD won't make a noticeable difference.
I believe there are differences between pipe and tubing when measurements are made. From what I have been able to gather recently, pipe is measured by the inside diameter where as tubing is measured by the outside diameter. The wall thickness also comes into play.

I guess the important thing here is to make sure all your exhaust components match for best flow.

Last edited by siman; 08-13-2013 at 08:11 PM. Reason: Got in a hurry to post and made a mistake.
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post #33 of 48 Old 09-15-2013, 11:08 PM
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Re: Want to build a custom exhaust? Read this first!

Again these threads are amazing, I had the hardest time choosing how I wanted to set up my exhaust, I love my stock exhaust, but also wanted a iittle more beef to it, without making my neighbors angry. Not that it matters because they all love cars to death!
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post #34 of 48 Old 11-06-2013, 05:33 PM
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Re: Want to build a custom exhaust? Read this first!

Great Thread! very informative
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post #35 of 48 Old 01-08-2014, 11:12 AM
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Re: Want to build a custom exhaust? Read this first!

Lots of information in this thread. I hope to learn from all of you the best way to get performance and mileage out of my 2008 Tib.

Thanks...Jeff
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post #36 of 48 Old 01-20-2014, 05:27 PM
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Re: Want to build a custom exhaust? Read this first!

I just put an 18 inch long hushpower 2 after an aftermarket ceramic highflow converter and it sounds great and idles quiet enough that no one notices early in the morning. i've got SSa headers and an e bay cat back. I happen to live where there are no emission tests though so if I sell the car to someone in the city not sure how it will do. I just welded the items in line with some 2.25 SS pipe and welded the flanges from the headers to one end the cat back to the other. much nicer than the straight pipes I'd been running for about a month.

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post #37 of 48 Old 04-21-2014, 05:12 AM
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Re: Want to build a custom exhaust? Read this first!

One of the best threads I've ever read. Lots of great info.
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post #38 of 48 Old 04-25-2015, 01:49 PM
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Re: Want to build a custom exhaust? Read this first!

I ended up having my cat-back built for only $475. All new 2.25in piping with a resonator delete and two flowmaster super44's. Absolutely love it!
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post #39 of 48 Old 06-28-2015, 01:59 AM
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Re: Want to build a custom exhaust? Read this first!

I know this is a LITTLE late to the party, but had the opportunity at my school to not only play around with a flow bench, but get the expert advice from my teacher that has a degree in acoustic engineering, along with being able to drill baffle plates and weld them into cylinders and then flow bench test them. After that I was able to install them in a custom designed quad titanium burnt tip exhaust system and fit them onto my existing exhaust.

Here is a video of me dyno testing it under actual load.

https://www.youtube.com/watch?v=NlppUPs71tc

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post #40 of 48 Old 07-14-2015, 03:20 PM
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Re: Want to build a custom exhaust? Read this first!

Hi ! i clicked on a random active post but how do i make a post ? im sorry im new and dont know how to use this...
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post #41 of 48 Old 07-14-2015, 05:26 PM
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Re: Want to build a custom exhaust? Read this first!

Quote:
Originally Posted by christianpelayo View Post
Hi ! i clicked on a random active post but how do i make a post ? im sorry im new and dont know how to use this...
You can't start threads from the Active Post section, head on over to the Forums tab and pick one of those, and then you'll see a black "Post New Thread" button on the top left. Try introducing yourself first in the Newbie Forum, and then ask any other specific questions you may have in their related forums.


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post #42 of 48 Old 08-26-2015, 07:44 PM
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Re: Want to build a custom exhaust? Read this first!

I am looking to upgrade my exhaust but have not really found anything thats under $1K. I am looking for it to improve my overall performance just for my everyday driving as i drive over 100 miles a day. What would be my best options for one? Also besides adding an exhaust, what else can i do to improve my performance? I already have a CAI and upgraded my spark plugs. any suggestions are welcome... Also I am not looking to break my bank as 1k for an exhaust system is too much for me.
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post #43 of 48 Old 12-08-2015, 04:17 PM
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Could I have a full 3 inch exhaust then at the y pipe go to two 2.5s? Or would it be better to keep the 3 inch the hole way I would like to use the new sfr exhaust but I need 3 inch piping since I'm going f/i
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post #44 of 48 Old 12-08-2015, 04:23 PM
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Re: Want to build a custom exhaust? Read this first!

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Originally Posted by Codoje View Post
Could I have a full 3 inch exhaust then at the y pipe go to two 2.5s? Or would it be better to keep the 3 inch the hole way I would like to use the new sfr exhaust but I need 3 inch piping since I'm going f/i
Actually, you WANT to drop the pipe size when you split the flow. You DON'T drop it by 1/2 since you also have internal "skin friction" to contend with, but you drop it by a fair amount.

In my mind, for a 2.7L engine, there is NO NEED for anything larger than 2.5" pipe (2.25" may even be enough) whether you're NA or FI. You just can't push enough air through the engine (or intake, etc) to matter.
Plus, big pipe is a lot harder to fit in most vehicles along with the weight & cost.

If you're doing a very high RPM engine (say a "built for 1/4 mile") and only want top end power, your exhaust would likely be very short anyway, thus not much issue.

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My car: 1998 Legacy GT wagon, 2.5L, 5MT, 176K miles, "Quicksilver", not stock and not slow...
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post #45 of 48 Old 12-09-2015, 05:22 PM
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Re: Want to build a custom exhaust? Read this first!

2.5" Piping will do fine for up to about 400bhp. Think about that too.

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post #46 of 48 Old 12-09-2015, 06:18 PM
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Quote:
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2.5" Piping will do fine for up to about 400bhp. Think about that too.
Oh I didn't know that maybe I will go with 2.5 then the new sfr exhaust will be mint then
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post #47 of 48 Old 07-19-2016, 01:42 PM
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Re: Want to build a custom exhaust? Read this first!

Wow great onfo guys thanks for the read
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post #48 of 48 Old 09-15-2016, 10:36 PM
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Re: Want to build a custom exhaust? Read this first!

great write up and great pictures dude!
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