Hi mate,just my opinion but with out a heatshield i wouldnt bother fitting an open cone filter,you will get alot more noise but you will also get the downsides which are all the hot engine air being sucked in and it wont do much if anything for performance.
Ive got jabba induction kit with a big stainless steel heatshield that seals against top of bonnet insulation,ive got all the noise you could want and only cold air gets sucked in.Ive also routed ducting down to front fog light as i have FMIC and have done away with fog lights so the filter gets all the cold air it could ever want.