Alfa's just stop to
Join Date: Jun 2009
Location: United Kingdom
I also have a ph1 twinny and have modified it a fair bit over the past few years.
Like you I didn't want that boy racer sound, so I went for a 'mid sport' cat back system by longlife exhausts.
This gives a nice burble on tickover and nice but not intrusive rasp when accelerating.
If you also fit a k&n filter, you will find that the 'twin spark' induction sound is more audible.
In search of a few more hp, I also removed the cat with a link pipe, and this give a little more rasp.
Hope this helps.........