unit took air in through a vent at the front and ran it out through a filter at the back. The Air Fantasy system was connected to the vehicle's own air-conditioning system and would pump small bursts of scented air (from one of three replaceable scent packs) either automatically or on demand through the air vents. Although the roof unit is relatively common for an optional extra, the Air Fantasy is especially rare. Fragrances include Deodorizer (White), Morning Green (Orange ), Peppermint (Blue), White Herb (Green) and Sazan Floral (Yellow) The CleanAce system might have been intended for smokers. There are a number of after-market systems which replace the cabin light and perform a similar job. Aftermarket variations Many Toyota Seras have received aftermarket additions or improvements aimed at extending the usable life of the vehicle, improving the overall performance or to rectify commonly perceived issues such as body roll or poor headlight levels. Engine tuning By far the most common mechanical improvement is the tuning or complete replacement of the engine (otherwise known as an engine swap). The factory standard 5E-FHE produced when new, and is the most powerful of the naturally aspirated versions of the Toyota E series. However, with minimal modifications to the car itself, this unit can be replaced with the 4E-FTE engine from the Toyota Starlet GT Turbo ('Glanza') which develops . This has been successfully transplanted in a number of Seras in Japan, Australia and the UK where the 'bolt-on' nature of the change and the relatively cheap price of both the replacement engine and additional parts (due to the large numbers of Starlets produced) make it much more attractive than tuning the existing 5E-FHE with custom parts. The Starlet Turbo can be additionally tuned to give substantially more power (175-200 bhp) than those officially released by Toyota. However, in order to achieve these levels of power it is necessary to make quite a number of changes, such as exchanging the intercooler for a larger version and relocating it to the front bumper, installing a revised exhaust and induction kit, plus a number of electronic engine management devices to alter the fuelling and turbo boost safety points. More specialised options have included using the 20-valve 4A-GE ("Black Top") engine from the AE111 series Toyota Corolla Levin and Sprinter Trueno, which produces around , giving the car a power-to-weight ratio of 5.63 kg/hp (in comparison