Added a Sparco Chrono Touring seat (not a lightweight race seat) but it still knocks me out of stock class. Per the Mouton site, Solo II BMW class FSP is for the 318i...no listing for ti. (318ti is in G class) so I assume the seat puts me in either the street prepared or ST class.
FSP is street prepared, but I think the 318ti is sent to DSP. Someone will correct me... You can go into STS if the seat is 25lbs with the mounting bracket.