You may have a hard time getting this info regarding toda specifically but there is more than enough info on header building around the web. It's a fun project and I wish you luck.
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Then we will improvise ... 
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Here is what we managed to do.
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http://www.tsxclub.com/forums/attachments/1st-gen-engine/25897d1440106960-custom-exhaust-manifold-4-2-1-lengths-pipes-20150820_153550_hdr-copy-.jpg?stc=1
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http://www.tsxclub.com/forums/attachments/1st-gen-engine/25897d1440106960-custom-exhaust-manifold-4-2-1-lengths-pipes-20150820_153550_hdr-copy-.jpg?stc=1
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Not very loud ... but it is still 3 ''
There is great improvement in torque at low revs and in Vtec accelerates much more.
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There is great improvement in torque at low revs and in Vtec accelerates much more.
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2
I do not have sound clip but will record soon.
After the exhaust manifold has a flexible exhaust connector ,then is resonator muffler.
After the collector to Y pipe was 3 " and then goes to 2 x 2.5"
Exhaust manifold is narrowed to 2.5 "to accelerate the exhaust gas and then out of 3"
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After the exhaust manifold has a flexible exhaust connector ,then is resonator muffler.
After the collector to Y pipe was 3 " and then goes to 2 x 2.5"
Exhaust manifold is narrowed to 2.5 "to accelerate the exhaust gas and then out of 3"
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