hi guys

got a 97 vti, with engine in great nick. keeping on petrol and cng. was considering to sell it out coz wanted to shift to a more spacious vehicle. but now thinking to keep it.
i just wanted to know of some performance mods which dont cost me a good fortune. i am not into mufflers and u know, that kinda larhkon walay shashkay with the car. just want some performance upgrades.

yours advices and suggestions would be highly appreciated.
regards