has anyone fitted a DIY diffuser and seen improvements?
its something i'm considering for my car. it has pretty good /flat floor already but some parts at the rear bumper could be better if there was a smooth panel there.
that part of the underfloor already slopes upwards so easy to fit a "boy racer" ebay flat panel with straighteners. Do you think it'll make a noticable difference?
I'm thinking about something like this:
https://www.ebay.co.uk/itm/1X-Abs-Un...9/303179537634
