It should feel quite 'punchy'. Even the 115 goes well, as it's a torquey engine. You've obviously got issues somewhere. Probably wisest to go through the simple things first.

When was the air filter last changed? Or the fuel filter?

Have you got any fault codes coming up?

Has it always felt this way?

Does it make any odd 'whooshing' noises?

What condition are the boost pipes in?

Does your EGR have electrical an connector on it? If not consider blanking it off to see if it makes a difference.