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Message: <blockquote data-quote="normality78" data-source="post: 2536785" data-attributes="member: 17">there is too many factor that play into it. here is afew i can think of.1. if your stock na manifold is 4-2-1, thn u canot use as the final collector is way bottom of the engine and the turbo will sit too low. If turbo sit too low, u will have problem with oil return and also danger expose underneath the car.2. if your stock na manifold was 4-1, u also need to see how low will the turbo sit. thn u will need to see the turbo placement as 4afe oil filter was located at the left side of the engine block (facing the engine). To manufacturer, the na stock manifold wasnt design for turbo purpose hence your stock manifold final collector could be just nice in the middle and if you bolt ur turbo there, you will hit or block the oil filter. 3. na manifold pipping abit too small. try to look at ur stock manifold dia size and the after market size (2") thn u will know. you may not have sufficient gas flow to optimise the turbo.4. This has been discuss before, do a search and u will find it. Basically it got something to do with exhaust pulse, tuned length and so on. 1st u will need to know how engine work (firing sequence) thn u will understand why its crossed. However in turbo manifold, it can be all dump in together or 1-4,2-3, sequenced.</blockquote>

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