I had the single exhaust on my ‘96 Plus 8 replaced with a straight through twin system. I’m not sure that I can tell the difference as far as horsepower is concerned but it sounds great (to my ears), it pops and throbs wonderfully and I never tire of it, even on the long drive from Kent to the Isle of Man. I guess it’s all relative and down to personal preference, a friend has side exhausts on his ‘89 Plus 8 and it’s even louder than mine!
