Your Vauxhall astra club 1.6 makes a horrible noise when you accelerate its like puffing sound it passed mot fine but would to know what could be?

1. Vacuum leak: Air leaks can cause all kinds of strange engine noises, including puffing or hissing sounds. Check for leaks in all the vacuum hoses and connections, especially the hose connecting the air filter box to the throttle body.

2. Boost leak: If your Astra is turbocharged, a boost leak can also cause a puffing sound. Check for leaks in the turbocharger system, including the intercooler and turbo inlet/outlet pipes.

3. Exhaust leak: An exhaust leak can also produce a puffing or blowing sound. Check for leaks in the exhaust manifold, exhaust pipe, and muffler.

4. Bad lifter: A bad lifter can cause a ticking or tapping noise, especially at low RPMs. Listen carefully to the engine and see if the sound seems to be coming from the valve cover.

5. Worn timing chain: A worn timing chain can cause a clattering or grinding noise. Check the chain for wear or stretching.

If you're not sure what the problem is, it's best to have the vehicle inspected by a qualified mechanic.