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sorry, i was confused by your quote of EPA regs which only referred to noise,
FWIW - i got an engineers certificate for my B16A Prelude, it had a exposed K&N pod and was fully tested, and certified compliant with ADR's by an RTA approved engineering signatory*.
http://home.exetel.com.au/tinkerbell...bay.top.01.jpg
* DISCLAIMER - just because my car was certified like this, doesnt mean it is fine for everyone to drive around with uncertified pods...
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hey tink who did your engineering?
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he may be retired, but he is still listed - Bruce Elson
http://www.rta.nsw.gov.au/registrati...s_nov_2007.pdf
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cost around $550 to certify everything, including driver seat, dash, engine swap, exhaust dB, emissions, battery relocation, fuel system, wheels and tyres, brakes, suspension...