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hmmm, i think the best way todo it is for Racer-X to try it first and give us his results. I dont think very many people have experience with doing this to there stock Boxsters...It might have to be a experiement.
I did this to my last 300zx Twin Turbo and it worked fine.
I bought the valve and took it to a Muffler shop and they welded it in place, I drove it home and installed the wires and it did increase the engine noise alittle bit but the spool up was way more awesome...but out boxes will get real loud since we dont have turbos to cancel out the exhaust noise like a Twin turbo Z would.
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