Quick thread up. Coming into a Billyboat TBE. Going the spacer route once I get it. Can someone put down further input on the suggested route? Literally been researching a bunch. Everyone has their own way. Two spacers or one on a CBFA engine. Second and last, or just second o2's. I have gotten some input, but I just want the best route the first time under the car. 42DD or Rai J-shape spacer? Heard of some vibration issues with the Rai. If anyone could help that would be great. I know this is beating a dead horse as its been discussed multiple times, but since most threads are old it might be time that someone has nearly perfected spacers. Thanks guys.