No we just changed the front suspension to get the rebound spring out of play at ride height to reduce the initial wheel rate to increase compliance, then supplied the twin spring stack for the rear out of the SSL 5L to give better ride. Both helped ride and handling by providing better grip over poor degraded surfaces.
I will leave exhausts up to others, though I was once Chief Eng of a German OEM exhaust company - but that was in the 1990's
Cheers Peter aka PJB (SSL)
