I will be installing the Cosmo upper and lower manifolds, 20B throttle body and elbow on my 13B. I know that you have to go aftermarket on the fuel set-up because of clearance issues with the secondary fuel rail but, will any aftermarket fuel set-up work? I'm looking to go with 00RX7 (JC Motorsports) fuel kit. I also know that I have to match port for the lower mani.

Do I have to cut the 20B elbow? If not, what is that sensor on it for? If it's recommended to cut, I don't mind. Also, will the plug for the tps on the stock harness reach and fit the on the 20B? Please post detailed pics if possible and, comments. Thanks guys and gals. Merry Christman and Happy New Year!!!!!!!!

 

That's Merry Christmas...not Christman

 

There is probably less than one handful of people on this forum who have done this mod. Here's a writeup from one of the few:

https://www.rx7club.com/showpost.php...2&postcount=17

 

Thanks Mahjik!!

 

Wow, that seems like a major pain in the ***...

 

Hey man, I'm actually having Brandon (OOrx7) make me a 20B secondary fuel rail. I'm modifyin' my LIM for clearancin purposes so maybe the one he builds for me will work for you as well? I'm gonna talk to him sometime this week and have him look over my manifolds. He or I could let you know if you need more details.

Later,

Rizwan

 

What kind of gains will you guys be seeing from this/

 

Thanks Riz, keep me posted!

 

It will be hard for me to say because I'm not just doing the manifolds, tb conversion, I'm also getting the motor ported and going single turbo. The difference in these manifolds are; the runners on the upper is shorter and the openings on both are larger.