i've got a blitz filter on a stainless hardpipe and it sounds great.
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however i think the filter is only stopping animals and trees getting in my engine, as the holes are quite big in the filter.
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loads of road dirt must get in my engine every day.
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then again, it's still going.
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i do like the sound, but i don't think i'd buy a blitz filter for a beloved engine.
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this one came with the car and i'm changing the engine so i don't care.
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my mate has a k&n but it's not that loud, still sounds nice just gets drowned out as the revs rise.
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edit:
my car
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'93 rev2 NA
mate's car
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'92 rev2 with rev3 engine NA