Get 4.27 differential(from 91 and up models) and perfomence chip (Dinan is good) and then save up your money to get turbo. IMO these are cost-effective upgrades, rest will be in the bullpark of 1-2K$ per 1 hp.

Intake/exhaust upgrades are worthwhile on 750 but on 735 they will give you at most 1-2hp boost. Again IMO for 735i intake and exhaust are not limiting factors for 735s, I personally took my muffler, cat and air filter off and did not notice any difference in perfomance when I took it for a spin around block so I put them back on and drive with stock ever since then. Reading boards different people pretty much confirmed my opinion, only they spent big buck to reach the same conclusion.

• need info on air intake increase - bmwobsessed 2004-10-17 17:04:16 (382 views)
  • AFAIK air intake is not limiting factor on a stock engine (nt) - sinij 2004-10-18 00:13:52 (359 views)
    • Re: AFAIK air intake is not limiting factor on a stock engine - bmwobsessed 2004-10-20 01:39:54 (315 views)
      • Re: AFAIK air intake is not limiting factor on a stock engine - sinij 2004-10-21 09:57:24 (378 views)
    • try this one - MAF upgrade (url) - shogun 2004-10-18 07:45:30 (405 views)
      • Re: try this one - MAF upgrade - sinij 2004-10-20 12:44:47 (431 views)