Originally Posted by ZXBMW330xi
I am a new owner to one of these fine machines. I have been doing some searching online trying to find some upgrades to improve the perfomace of my 2004 BMW 330xi.
I'm interested in putting in either a Turbo or Supercharger but not very knowledgable about if there is anything that I should/recommended do before this. Any ideas are appreciated... Perfomance Chips etc I'm open to all. Now keep in mind that this wouldn't be strickly for racing but I'm looking to give my car a little more agressive feel / sound.
I am assuming yours is auto like mine. I've been considering similar upgrades however a point to keep in mind. Superchargers and turbos add tremendous additional stress on tranny. Most of the superchager and turbo manufacturers put a disclaimer in regards to adding either and potential damage to Auto transmissions. If by some chance you have a standard either will work fine. The engine and drivetrain are rated to 450 hp stock, but most guys replace the head bolts with ARP. Stock ones too soft for either application.
If you have an Auto, then heat is the biggest consideration (other than head bolts). I would definitely install a larger tranny cooler and would also consider a tranny rebuild (depending on milage) before bolting on either.
As far a which to go with, Supercarger will run $5000 - $7000 and suprrcharger starts @ $7000. I'd go supercharger, simply because its more bolt-on, easier to setup, more reliable and gives an additional 80HP. Also, no turbo lag. Turbo will give you bigger HP gains, but is tougher to setup, configure and maintain.