For the very loudest sound you need an open cone filter, problem is you also suck in hot air from under the bonnet which isn;t good for you cars performance (cool dense air = your car performing best) so a heat shield can be rigged.
I know jabbasport do one for the Ibiza (not sure if they do an LCR version) and I think awesomeGTI do one called Neuspeed P-Flo but I don;t know much about it
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