Hi people. I have an n54 135i coupe and have just had my intake valves walnut blasted by SWSS Mini in Cardiff. First off I have to give a shout out to the guys at SWSS. They did a brilliant job with great customer service and were a really friendly bunch of guys; something I think that has been lost in recent years when it comes to car mechanics! The price was also very good considering the time it takes to do the job.
So the pictures below show the before and after. The difference on the road is very positive. My car has around 69000 miles on it and the engine now revs more freely and has a much crisper exhaust note.
As you can see the results speak for themselves.
Happy to answer any questions. ☺