im putting a b20 in my 99 integra and im usingthe gsr head i have a ecu with hondata in it already should i leave that ecu in there and get it tuned after i swap it?? also can i use a LS transmission on the b20 b/c im going to turbo it all input is good thanks

 

yes and yes

 

My buddy's running an itr tranny on his b20v turbo and it's perfectly fine. You can use an ls tranny since the gears are much longer. And yeah you should leave your ecu in there.