road car cam for my 318

My opinion is you will never in a million years feel the difference between a 112 LSA and a 108 LSA in such a mild build. However, the 112 LSA will have a better vacuum signal and operate vacuum accessories such as power brakes better than the 108 LSA all things equal. It's just not a decision I would dwell on for two minutes. I'd have one on the way already.