Im passionate about carz and after my purchase of New Ford

Im passionate about carz and after my purchase of New Ford fiesta(1.5,90bhp) Diesel which im enjoying like any thing after the run of 19000kms with average of 19-20 on Highways even when i drive at speed of 100-120 km/hr (only on good conditioned highways),its really gr8 driver car with Boron steel built and gr8 suspension & kinetic design n have very rich features in 10.50 lacs segement,even the new eco sport also carry the same engine n plateform. Now i want to knw dat whether i shall go for Synthetic oil this time for service cuz ford uses the same oil which they have used for ford fiesta classic diesel (1.4) & second thing i want a little more Enhanced Bhp (around 110-120) which is possible. But tell me right workshop if any around delhi or noida where car Warranty does not get effected. And tell me shall i go for K&N filters(fuel and air filters) or Universal filters or Pete's air filters etc to enhance the performance and last but not least the company fitted Goodyear tyres are worst and after 40k i would like to change so suggest me whether i shall go for Bridgestone or Michillain or any other and the last question is Oil filter of which company can be best Buy...Dev