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Old 02-22-2012, 11:43 AM
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intake manifolds

Did the intake manifolds change somewhere around 99? Did the diameter change? From what to what?
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Old 02-22-2012, 12:09 PM
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Yes they changed middle 99 from I believe around 2" early 99 to 3" late 99
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Old 02-22-2012, 12:14 PM
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^^^Yup
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Old 02-22-2012, 02:38 PM
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They also changed within the 2" versions (from 8-bolt to 10 bolt). I want to say mid-96 maybe? but I'd have to check. Cheers!
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Old 02-22-2012, 04:43 PM
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94.5-97 was a "Y-pipe" - directly off the turbo into the plenums.
99-99.5 was a "Spider" - from the turbo, to CAC, back to the plenums.
99.5-03 was a "Spider" - same design as 99-99.5, but 3" diamater as opposed to 2".
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Old 02-22-2012, 05:14 PM
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Thanks guys, Is there reason everybody wants the early spider for the obs trucks?
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Old 02-22-2012, 05:18 PM
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The early spider has the 2" outlets that match the OBS intake plenums. A 99.5+ spider would not match up.
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Old 02-22-2012, 05:27 PM
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unless you change the intake manifolds?
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Old 02-22-2012, 05:35 PM
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You'd have to put some 3" SD intake plenums on, as well as do a fuel bowl delete in order to run a L99-03 spider.
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Old 02-22-2012, 05:45 PM
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The turbo flange is different as well (that's why the need for the early 99 spyder, it would mate up with our turbos). With the early 99 spyder you also need the boots that stepdown from 2-3/8" to 2" and a different turbo clamp. Cheers!
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