Honestly unless you are really into all-time racing...you won't need any upgrades on your vitara....keeping the stock equipment on the right and proper specs all the time will do enough good to get you through your routine...even on off-roading and short races.

....it does wear-off din so changing may be necessary after a few years of use (say 3 or 5 years depending on how often it is used). But to change it to an after market equipment which may be twice or trice the price is something I would not find practical....UNLESS I'M INTO RACING BIG TIME.

IMHO, work within in the capability of your ride would be the best. Pag na out-grow muna then upgrade (sell your ride and get a 2.0L engine off-roader or better still get those powered by a 6-cylinder ones) your off-roader and feel the difference.

just my 2 cents. peace