I am driving bravo hgt....Yesterday i was rolling with honda civic vtec vti with superspirint exaust, k&n filter, supersprint manifold and chip. I bit this car on top speed, but on 402m i am slow. My plan is to install 20v or 16v turbo from coupe, but until that what can i do to make the car go faster???

its not just a case of attaching the turbo from a coupe, but you know that dont you?

Try smaller overall diameter wheels/tyres for quicker acceleration.
Sadly this will decrease your top speed!

this advice/info any good??

I would 1st ensure that your car is serviced and in good health.
Both cars are similar weights so it does not make any sense that you should be left on acceleration yet quicker on top speed. unless your car is not revving properly.
You should feel a surge past 3.5k revs all the way to the redline.

My car is in good condition, but its standard. My friends honda have some modifications. Can i fit another shorter gearbox???

I'd not bother wasting time/money aiming to beat one single car, I'd leave it well alone and sink my time and effort into fitting the 20v turbo engine.

marea gearbox is shorter. cleaning the MAF with an alcohol spray can make a huge difference.