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Redyaris, i would like to know how you attached the undertray to the car. I was thinking of rivnuts but they entail drilling the chassis, something i am not keen on. Also, how did you finish the front end of the rear undertray, where it meets the rear axle. I see you didn't use the tow hook anchor points to fit the rear undertray as i see the tow hooks sticking out a little through the undertray. Did you simply screw it to the bumper? Mine is the mk1 yaris and the lowerpart of the bumper is metal and not straight. But it does have two m6 holes to attach the bumper.
I had an attempt at an undertray before but it didn't deliver any mpg gains. Mind you, my tanks at the time were lasting 4 weeks and the weather changes a lot here. So i wouldn't see under 5 mpg and attribute it to a mod with confidence. But i like your workmanship. More pics please!!
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