The standard Lotus exhaust is made of (heavy) mild steel. It will rust within a few years and leave unsightly dribbles on the bodywork. Stainless steel upgraded exhausts are very common and sound much better.
While looking at the exhaust, check the condition of the exhaust mounts. Are the outlet pipes central in their aperture? By removing one rear wheel you can inspect the condition of the mounts for the catalysic converter and muffler.
Does the car have the original rusty steel exhaust? Take one rear wheel off and look closely at the rubber mounting blocks supporting the catalytic converter and muffler.