Recirc wont give you the noise without a kn gen 2 cone.

If i wanted a dvalve i'd buy the noisiest one

I'm not generally a fan of bailey pistons. I prefer a diaphragm valve and hence removed it from the focus.

When the atmospheric dumps on an frs the engine doesn't "see" the air return and pops in more fuel. This can creats some interesting pops and bangs when backing off the throttle after some leather.