Engine sounding like a tractor

[greysquirrel]

Just got back from a 2k mile tour around Europe and car behaved very well, except on the last day driving back through belgium it started sounding like a tractor. Flooring it on acceleration really shows the noise which is a raspy chug-chug . Anyone know what this could be?
Thanks

[kal-el]

Cracked exhaust manifold perhaps? That happened to me. Not necessarily a bad thing as it's a good excuse to bin the cast iron cr*p, and fit a performance s/s unit which is much better!

[greysquirrel]

hmm, would this be on the bottom of the car? Went over a huge rock in the alps and something made a loud bang!

[ferrisbueller]

greysquirrel said:

hmm, would this be on the bottom of the car? Went over a huge rock in the alps and something made a loud bang!

Check the pipe between the downpipe and the cat. You may have caught the flexi section.