So since my CT26 is rooted I am looking to get a CT20b as an upgrade. Just wanted to know is there anything I would need or do for the conversion like the down pipe or so? Or is it a straight bolt on? Also if anyone has any tips on doing it that would be great.

Its straight bolt on. dump is the same except you'll be missing one of the bolt/mount holes which is no biggie.

Hey Ant1. If you're planning on upgrading the dump pipe some time anyway, having the turbo out makes this a good chance.
Other than that, make sure you watch those AFRs once you're done. Just got a hi-flowed ct26 into mine and between it and the new exhaust, found its able to flow way more air than my gen2 fuel system can match, so it could run way too lean if I overdid the boost. 16psi is my safe limit but there is much more boost available (which will be handy when the ECU and fuel system gets upgraded). Check my showroom thread for the dyno chart and you'll see what I mean.

It's not quite a straight bolt on, there's a few minor differences.  I posted a thread with several photos showing the differences when I did the same conversion, but I can't find it on the new forum.  Here's a link to the thread on the old forum, but the photos aren't showing up :(  Edit: Admin has now fixed the photos 
 
http://www.mr2australia.c...rue&TOPIC_ID=21150
 
Regarding the conversion, it's well worth it - practically no difference in initial spool, but solid boost right to the redline.  You'll also need a boost controller of some sort otherwise you'll only get the same boost as the CT26 (around 10psi) if you use the gen2 boost control system, and of course an FCD so the ECU doesn't stop the fun at 12.8psi!!  I have been running mine at 16psi for a couple of years with no issue, using the EBC and FCD functions of a MAP-ECU2.

Thanks for the tip, will keep that in mind.

Thanks, I'll have a look now. I have an Apexi Type R boost controller (that I havn't fiddled around with much yet), an aftermarket ecu (so I wouldn't need the fcd, just a tune maybe?) and a fuel regulator (which I also havn't fiddled with and don't know how to lol). Would a CT20b be good to hold as much power as a CT26?

ct20b flows slightly more than at ct26 and can hold higher boost levels due to a steel exhaust wheel, instead of the ceramic wheel on a ct26 Ant1

Awesome, thanks.

MCT_MR2

ct20b flows slightly more than at ct26 and can hold higher boost levels due to a steel exhaust wheel, instead of the ceramic wheel on a ct26 Ant1

so there were no ceramic wheeled CT20bs?? I thought the JDM ones were still ceramic.

Ct20b have a ceramic wheel also. Only the grpA/Wrc 205 had a steel turbine.

Short answer, it's just a better/newer design, it flows more than a ct26.

thanks ace, I thought that was the case.
I'll be looking at this upgrade next year also :)