This one i made myself out of fiberglass...just to see what i can do. Im too poor for a j's or Top Secret diffuser so i thought id try and make one. Anyways tell me what you think

Thanks!

 

Umm, it's pretty simple lol. Maybe if you were to make it have four fins?

 

ill probably make a larger one and add more fins. This is just something i wanted to see what i can do with the fiberglass.

Thanks

 

i would use bigger screws or atleast bigger washers if you plan on going anykind of fast with that on.

 

i tested it on the H3 going 125 when i pulled over it seemed fine to me. Im more worried about bumps.

 

I think what Taka's trying to say is not so much short-term but more long-term based on vibration from prolonged driving but I could be wrong.

Interesting idea, can you take more pics from directly behind (to be able to see the whole car) ? Looks good otherwise.