Supercharger or turbo
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I think you need to know what your budget is first and foremost and what are your power goals.
If it was an unlimited budget I would always go turbo just for the general ease to increase boost and make power as well as the overall efficiency of a turbo compared to supercharger.
For ease of install and a smaller budget with moderate gains I would do a supercharger. Easy to maintain, low entry price but you can't just turn the boost up to see more gains. Yes you can install different pulleys but every supercharger is going to have limits.
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Most superchargers sound like garbage.
I say remote mount turbo
I worked on a GTO with a rear mount turbo set up years ago. Plumbing... Plumbing for days...
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It is a good way to go if you want to go turbo and be able to revert the car back to stock easily.
-Intercooler not needed
-uses stock exhaust manifolds
-keeps excess heat out of the engine bay
STS makes kits but it wouldn't be difficult to make your own. Their site will give you an idea on what its all about.
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Something like this should work...
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I can't do that for me e90 325 can I?
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I can't do that for me e90 325 can I?
Sure thing.
This is on an E46 325i
http://forums.bimmerforums.com/forum/showthread.php?1491575-TURBO-PROJECT-E46-325I-10-15-lbs

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That wud be sweet if I cud
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It is not as efficient as one mounted closer to the engine with higher pressure + higher velocity exhaust gas, but the advantages I see are not having to buy an exhaust manifold or intercooler (you can say the same thing for a supercharger) and not having to deal with hacking things up in the engine bay to get it to fit. The OE mufflers are quite large so removing that gives a decent amount of space to work with.
Its not the best way to turbo, but like i said, If you have some money to burn on a car that you will eventually return to stock and sell, then a remote turbo system would be very easily reversible.
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Its definitely one of the better alternatives I would say.
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