Personally I would still go with an exhaust. The resonated Milltek I have looks and sounds totally standard (bar the two pipe ends are slightly larger). Hardly noticable.
My reasons being. Free flowing exhaust will up the figures - 5-10bhp? Also I had a cat back version until very recently. The cat in the system had constant soot build ups causing regular and embarrassing puffs of smoke. A decat pipe has now been installed and now the puffs are gone.
Ideally I should have had the decat pipe installed at the time of the map in order for the mapper to optimise the set up (I did think that at the time).
It is possible that you could also end up with puffs of smoke following a map due to the cat. Food for thought hopefully.
My reasons being. Free flowing exhaust will up the figures - 5-10bhp? Also I had a cat back version until very recently. The cat in the system had constant soot build ups causing regular and embarrassing puffs of smoke. A decat pipe has now been installed and now the puffs are gone.
Ideally I should have had the decat pipe installed at the time of the map in order for the mapper to optimise the set up (I did think that at the time).
It is possible that you could also end up with puffs of smoke following a map due to the cat. Food for thought hopefully.