Don't the cups have rs inlets. I'd think the 182 ones will still work fine
Whats the company called Dave in walsall?
182 RS Stamped are the best from the factory.
You really would struggle to notice the difference though, a rolling road might spot a bhp or two but it wont be enough to feel the difference.
If you fancy trying though, Lesley has got a set (upper and lower but the lower is what matters) for sale from our RB182 (we have an RS2 inlet instead) for 40 quid.