I have a custom speced predator z cam in my a4 with a circle d 4c 3800 converter and mine made 434 rwhp on a dyno jet. I also have PRC 2.5 5.3 heads, unported fast 92/92, long tube pacesetter headers, 25% underdrive pulley, 85mm TSP lid and 85mm z06 mass air. These numbers were also made thru a full LM1 exhaust with TSP catted y pipe with out a cut out. The cam is a 230/230 613/591 111+2 I think it has lsk lobes. I haven't taken it to the track yet but I will hopefully soon.

 

226/226 581/581 114+4 M6 here and made 405. Go a little bit bigger, with the new lobes and you'll have a great streetable cam that makes good power. And tune has a huge part to making it streetable as previously stated.