I have 99 Lancer, it has a 1.3 gas engine with caburator, i know its old fashioned but still i´m looking for changes that i could do to get more power from mi car.

I´d asked to make some changes in the exhaust, by installing a heather, but some people tell me that maybe it could not be good.

So what would you recomend.

Exterior changes are already done, so help me with the engine.