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Have searched but cant find anything!(coming off VERY soon for an Apexi) and standard dumpvalve.(??) to eliminate goose honk and also make the standard dumpvalve louder?? (But i cant remember or find where i have read it! 
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Now the standard dump valve vents to atmosphere! Sounds decent enough. Though I have heard that having the oem d/v venting to atmosphere doesnt do it much good (I read it here I think) hence why a ssqv will be on soon...(recirc pipe) Remove the pipe at the air filter end and bung the air filter end with something. Now you should be left with the pipe coming off the dump valve but its not attached to anything. Now it should 'pppsstcch' (vent to atmosphere)(black pipe quite large in diameter that goes from the dump valve to the air filter?) What do you put on the end of the dump valve though then if the pipe is removed?? One of those little 'breather filters'? Any other thoughts guys? ..does it damage the dumpvalve as Dean said having it venting to atmosphere?? And what do i put on the end of the dumpvalve, breather filter? Cheers(VTA) your MR2 is a rev3 so it runs off MAP (mass air pressure) instead of MAF (Mass air flow) like on the rev1-2s so you wont get the overfuelling problems which some rev1-2s have. I would keep an eye on ebay for Mr2 aftermarket dump valves like this one below as they have the proper adapter for the mr2. 
may give it a try and see how it sounds, esp if it gets rid of goose honk! Sorry to ask (again!) but if i remove the re-circ pipe and block the air filter off...what goes on the dump valve end?? Is it a little breather filter...or do i just leave it as it is with the pipe removed?? (but wont it spit little bits of oil out??)"goose honk" noise. So hopefully when you get yours it may fix the noise......yeah thats what i'll be looking for in the future...i just thought this may be a quick fix in the mean time! (eliminate goose honk with the HKS filter and make the standard dumpvalve slightly louder!) Do u know what goes on the dumpvalve after removing the recirc pipe?? 
is it a little breather filter? Whether you hear it above the apexi is another matter( Rev 3+ only ).. it is relatively loud darth vader... sound .... !! || S256SX Airwerks Powered MR2 Turbo || V10 BMW M5 ||Do u know what goes on the dumpvalve after removing the recirc pipe??
To be fair tho mate i'd splash out and get a decent BOV if thats the sound your after, standard sounds pants in my opinion, SSQV the way forward, plus you get an extra loud 'whoosing' sound with a proper BOV fitted. ..thanks andy for the reply to the question i think i asked every time i posted ha ha 
I will eventually get myself a non standard BOV, just dont have the money at the min so thought id give this a try! And if the standard dumpvalve doesnt need anything on it after removing the recirc pipe all i need is a coke cap to bung the air filter end with! 
