I have recently bought a bmw 323is I have been looking for a web site for engine upgrades (like a tubro) HELP!?

i would only buy authorized parts, check some BMW websites such as:

http://www.rogueengineering.com/

http://www.bavauto.com/

If I ever need anything for my M5, those are the two websites I check first.

I feel the need to add something: I would not turbo a BMW, keep it Naturally Aspirated, it will last longer, run better, and it will be cheaper. There are some easy things to do such as air intakes, exhausts, and larger, more powerful options such as new camshafts, rods or pistons, that you can get very good gains from, and not blow up your engine as misfunctioning turbos can. That's just my opinion, check forums, and see what other's think about turboing a BMW. Most often they are supercharged, because it is a more surefire way of getting power.

Good luck!

For what I'm guessing your wanting out of the car, quick from red light to red light, this 2.5 liter engine will never give it to you no matter how many thousands you throw at it! Think $6000.00 for a quality supercharger and about $2500.00 for a tall diff - might get close to a M3. This assuming you want it to hold together long enough to pay off all these upgrades!

Want to tune a Bimmer package to it's max? SEAT TIME for the driver at a performance school! This car stock... you will chicken out way before it lets you down on a track circuit! It is a driving machine not a drag racing machine...

try HORSE POWER FREAKS they are dope they fixed up my e46 m3 real good now at 1048bhp. Im not sure if they do 323i though i think it was 325 up but i guess it wont hurt to ask. Look this up on youtube hpfchris thats there channel and see how fast they get there bmw's its nuts.

Best of luck

There are many BMW fan sites that have forums with this kind of stuff on them..

another option is Streetfire.net.. they can answer all of your car related questions

I'd try looking into ststurbo.com for a turbo kit. They are one of the most reputable names in the industry when it comes to turbocharging.

you can go to

www.performancedepot.com

www.sportcompactonly.com