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Message: <blockquote data-quote="DropTopPony" data-source="post: 9192" data-attributes="member: 7995">With the TB and Plenum you pick up like 6-7HP on NA cars. The difference between the 70/75 is like 1 hp so if your planning on going with more mods in the future get the 75mm. I had a BBK75mm and C&L plenum on my basically stock NPI with no bad effects and when i went PI it worked fine, then with The P&P heads /cams helped more. Now i'm adding the blower so it will again benefit. All the TB/Plenums are about the same so find the best deal. If you look on ebay and on the corral in the 4 sale area you can find great deals on used ones. Accufab is way expensive for the 1HP it gains over C&L etc.....</blockquote>