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There are millions of posts about Z's smoking after installing a free-flowing exhaust and explanations of the stock turbos, (including Sport 500, Z1, etc) needing back pressure if they are a little bit out of spec... What about Porsche, Subaru, Audi... turbos? Do they also need BACK pressure? Anyone out there with upgraded exhaust and turbos that have no smoking problems? If so, can you tell me which turbos you have? Also, only respond if you have beaten your car on the track for a few seasons, as that is what I use my Z for...;) Thanks.
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