No real need for a heatshield, changing from the enclosed BMC to the open cone felt like I'd removed a restriction, feels alot more responsive and definately breathing better for sure. An EVO owner did tests on his cone filter with and without a heatshield, the difference was tiny. Once on the move the filter gets plenty of cold air. The intercooler cools the intake charge anyway - not the air filter, the air filter just filters out dust and muck before it hits the turbo, the air leaves the turbo very hot before being cooled by the IC.
The sound is awesome - induction growl, turbo spool and dump noise - fantastic!
Yes it will fit an LCR as the neck is 80mm and I am running an 80mm MAF, the filter is FR-08001, rated to 410bhp and cost £46.28 inc.VAT.
http://www.jetex.co.uk/website/conicalfilters.php?insided=80mm