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Old Mar 5, 2013 | 05:18 PM
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Default Exhaust DIY?

Hi!
I am putting a LS1 engine from a Camaro in my Nissan 240sx.
I have some questions regarding the exhaust system on my LS1 swap.

- What size pipes would you recommend for the headers? I am going to fabricate it myself.
- How far away from exhaust ports would it be a good idea to assemble the 4 pipes to 1?
- Where would it be a good idea to assemble the 2 pipes, coming from both sides if the engine?
- What size of pipe is needed for the assembly of the 2 pipes going backwards?
- I am planning on, in the near future(maybe a year), adding a compressor. Does it make any difference in what size of pipes I should choose?

I hope these questions isn't to big of a mouthful! Any help is much appreciated!


Regards Jack
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Old Mar 5, 2013 | 10:14 PM
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I made these to fit a thirdgen with 1 3/4" primaries and 3" collectors. As far as lengths you will probably have to go with what fits.
Attached Thumbnails Exhaust DIY?-camaro-part-2-141.jpg   Exhaust DIY?-camaro-part-2-140.jpg  
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Old Mar 6, 2013 | 02:44 AM
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Originally Posted by ur-n-8
I made these to fit a thirdgen with 1 3/4" primaries and 3" collectors. As far as lengths you will probably have to go with what fits.
Cool. 1 3/4 is it inner or outer diameter?
What about the rest of the exhaust? My plan was only one pipe going backward. 3" or 4" when the headers are collected?
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Old Mar 6, 2013 | 02:54 AM
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go 1 7/8 inner diameter.. gives it a lower throatier bark
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Old Mar 6, 2013 | 05:42 AM
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header tubes are measured in od. so getting 1-7/8 inner is like a 2" outter. just get a standard 1-7/8 od header tube. nice work op
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Old Mar 6, 2013 | 08:59 AM
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Originally Posted by redbird555
header tubes are measured in od. so getting 1-7/8 inner is like a 2" outter. just get a standard 1-7/8 od header tube. nice work op
Thanks. What about the wall thicknes of the tubes?
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Old Mar 6, 2013 | 02:42 PM
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search for exhaust calculators - there are many available online that will help to determine proper primary size and length, collector size and length, merge points, etc based on what you're running. there's more to it than building what physically fits in the car, though that certainly is an important consideration.
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Old Mar 6, 2013 | 03:53 PM
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Also i think SIkKy makes some quality swap items including headers
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Old Mar 6, 2013 | 06:17 PM
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Wow, I can't even remember what I built. The pimaries are 1 7/8"
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Old Mar 6, 2013 | 09:07 PM
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what tranny are you running in the nissan?
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Old Mar 7, 2013 | 03:19 AM
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Originally Posted by rathersmart
what tranny are you running in the nissan?
T56:-)


Yes I know Sikky offers some headers, but my car is RHD and my engine mounts are home made, so don't thinks Sikky headers would fit:-(

But I'll try to find a calculator:-)
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Old Mar 7, 2013 | 10:21 AM
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I like this project OP. Continue updating us
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Old Mar 7, 2013 | 07:38 PM
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Originally Posted by Jack-DK
Thanks. What about the wall thicknes of the tubes?
I think 16 guage (0.065"). I'm not sure.
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