With a bit of modifying will the stock 13bt exhaust manifold bolt up to my 12A?

 

yep, just make one of these

 

u need to make an adapter(sorry i might not know the correct term..i am only 14 lol) using a 12 flange and and 13b flange and some pipe...heres a link

https://www.rx7club.com/showthread.php?t=539266....this guy had the right idea but wrong parts lol he shoulda used one 12a flange and one 13b but he used 2 12a's...it woulda saved him alot of trouble

 

damnit ^^^ wankelingbeer beat me to it while i was typin and finding link lol

 

yes you can, with slight modification, it has been covered many times before.

Please man, before I loose my mind, start searching before starting all these new threads.