a long time a go i removed a large portion of my 1.4 306s rear bumper to aid aero mpg motorway miles.

needless to say it worked but looked terrible,so ive been looking at less intrusive ways to gain some mpg.

probably start with an oem engine undertray.

ive been reading about tyre air deflectors, along with rear underside diffusers. anyone else tried these?

i know from fitting a front splitter (oem splitter was missing) to my xsi it made a huge difference to steering feel at higher speeds. but my gti6 already has its oem splitter.

ive seen people cover the rear underside gap with a sheet but thats a bit to much work for me.

is there anything else i havn't thought of?

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