[I]Well Bro As U Said...Let Me Tell You What To Do..
1.Get Air Intake
2.Get Your Car Tuned And Specialy Carborator Cleaned Well With The Carborator Cleaner Must Spend One Whole Bottle On Carborator And It Must Be Done By Good Expert Mechanic
3.Get NGK Laser Irridium Plugs Heat Range
4.Try To Keep Your Fuel Tank Above Then Half Tank..If You Keep It Full Then Thats Great..
5.Get 11mm Heavy Duty Plug Wires
6.Put Concentrated Caltex Coolant In To The Radiator And Water Bottle... And Please Even Dont Mix 1% Of Water In it..Because.. As Concentrated The Coolant Will Be.. More The Heat It Will Absorb..
7.Change Engine Oil,Oil Filter On The Time..I Change My Car's After 3000 Kms
And These All Wont Cost You Much...
1.4000 for intake
2.Carby Cleaner Costs 350
3.Plugs will cost around 3500 rs
4.Fuel depends On you How much u keep it
5. Wires Will Cost Around 5000
6.Coolant Will Cost 1000 rs
Total Amount:13850 Rounding Off 14000...
And Now If U Do All This.. I Am Sure You Will Change Your Mind Not To Put k20 Or nythin.. Because Xtreme Speed Is Not Everything...Am Sure You will Love The Perfomance Of Your D15b.
I did all the following i mentioned above and now i love my car's perfomance...
0-100 kms in 7 secs
And Top Speed I Took It To Is 215 kms And It Went Like Butter...Secondly Its Enough For Me..Life Is Precious For Me.. 
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