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Old August 4th, 2022, 02:32 PM   #1
Baby NinjaRR
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Custom pregen exhaust options

I'm trying to find a source for small diameter pipe, a 27mm-? universal 2-1 merger if such a thing exists. Everything else can probably be dealt with using thinwall emt, a wire feed, and maybe an apprentice with a hand bender but 2-1 collectors smaller than 2" don't seem to be a thing?
As much as I don't believe the stock twin exhaust on a pregen is much of a limiting factor in terms of flow/power potential the weight savings of a 2-1 has to be significant on such a small bike.
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Old August 4th, 2022, 04:31 PM   #2
DannoXYZ
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Yes, HUGE weight-savings going to 2-1. Check out this Area P pre-gen exhaust thread:
https://www.ninjette.org/forums/showthread.php?t=13852

Since it's already tuned for max-power at high-RPMs, more gains can be had in mid-range. Which is what you want on street-bike anyway. Apparently really significant gains in mid-range.

Check this out for merge collectors: https://coneeng.com/collector_components.html
and this for tubing: https://burnsstainless.com/collectio...ends-304-steel
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Old August 5th, 2022, 01:47 PM   #3
Baby NinjaRR
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Quote:
Originally Posted by DannoXYZ View Post
Yes, HUGE weight-savings going to 2-1. Check out this Area P pre-gen exhaust thread:
https://www.ninjette.org/forums/showthread.php?t=13852

Since it's already tuned for max-power at high-RPMs, more gains can be had in mid-range. Which is what you want on street-bike anyway. Apparently really significant gains in mid-range.

Check this out for merge collectors: https://coneeng.com/collector_components.html
and this for tubing: https://burnsstainless.com/collectio...ends-304-steel
This is interesting, thanks. The actual ID where the stock header mounts to mufflers is 1 1'4" but starts at 1" out of the head, interestingly enough. I'm inclined to agree about the stock twin system- it's like shorty headers on an old Chevy, good for nothing but the dyno.
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Old August 5th, 2022, 02:37 PM   #4
Ceeloo Yello
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Old August 5th, 2022, 03:15 PM   #5
Baby NinjaRR
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Originally Posted by Ceeloo Yello View Post
Subscribing to this thread
If I commit to this there will be awful flux core weld pics at some point...

Last futzed with by Baby NinjaRR; August 5th, 2022 at 03:16 PM. Reason: Misspelled
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Old August 5th, 2022, 05:11 PM   #6
Ceeloo Yello
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I can relate, I keep burning through when trying to weld thin sheet metal. Practice, practice, practice
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Old August 5th, 2022, 07:31 PM   #7
Baby NinjaRR
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Originally Posted by Ceeloo Yello View Post
I can relate, I keep burning through when trying to weld thin sheet metal. Practice, practice, practice
The last exhaust I tried to weld up had an extra spool of flux core attached but looked less like crap after attacking it w a grinder.
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