Yaar is it me or is the general pakistani way of doing modifications to a car 'stage 1 bana do'
LOL this always makes me laugh
Khair i think you should remove the restrictions in your intake, get a free flow exhaust with 2.5inch piping (headerback) and get headers. Cost should depend upon the parts you get- could be anywhere from 1500 to 5000 :S but these should be checked up. Do not rely heavily on islamabad but go to pindi. Get a mistri or someone that can make 2.5 inch pipes to make the exhaust for you if you want to get it custom-made. Stage 1 is a classic way of modification and while it is the cheapest, you don't learn much from it. There's other ways of increasing horsepower in a car other than adding stage 1 mods. NEVER add n20- please you're not in the fast and furious so you don't need it.
As far as the turbo goes, it's not such an expensive ordeal if you go for a smaller turbo- which i think you should go for since it'd be better on your fuel average even though turbo's aren't fuel average helpers I'm looking at one right now (garret turbo from a nissan) for $600.00USD on ebay. If you can get it shipped to pakistan, it'd be a good option since it's cheaper and i don't think you can get a turbo for less than a lak rupees there.
@moak is selling his turbo (look for his thread- its under the name "selling my turbo") It's a garret T3 turbo for $350 as much as i remember.