Expert Opinion: NO pakistani civic 2003 doesnt have cat.
Acceleration issue is 90 percent due to bad clutch system or even bad clutch cylinder.
i am having same issue of minor jerks and pickup for years done everything even clutch replaced but no success. atlast a mechanic told me that my clutch work isnt done properly as engine gives more noise and less acceleration.
few days ago i went to mechanic for clutch bleeding as he was doing it suddenlt the master cylinder died......changed it with kabuli one and i feel my car lot more powerful and quick especially in 5th gear it become rocket and yes are less i think tuning will enhance performance and so will changing clutch plate....dont go for new cylinder buy kabuli one(2000 pkrs)