I notice you say when you fit diffuser you need A LOT of force, i have done this fit and posted a guide up, you actually dont need hardly any force, if done right you can gently pushed in with one finger each clip of diffuser. The reason your having to use so much force is your not supporting the skin of the bumper from behind...place something behind the skin, be it a towel or a cork block (i used this) then the skin does not push back as you push diffuser inwards, few members have used my tip and also found a light gentle push gets the clips in.. hope this helps others
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