Before Kamei spoiler:
Two angles with Kamei spoiler:
When my 1302 was without the Kamei spoiler, I had a stock engine. I rarely went up to 70 MPH. It was an insecure feeling once I got to 65-70 MPH.
I did 110 MPH once since the Type IV upgrade with the front spoiler. Driving was much, much more secure. While driving over 90 is unusual for me on a daily basis, driving at 70 is not so unusual. The spoiler makes a big difference -- even around 18-wheelers.
The extra air for cooling is a noble idea but thus far I don't need it with a DTM cooling system.
I have no experience with a roof spoiler. I was considering one from Carbon Joe before he stopped production.