I used some loctite epoxie that you knead. It worked pretty well but is a bitch to sand/scrape/file down when you use too much. I filled in all the rideplate bolt holes, grate bolt holes, and the gaps around the intake grate.

Unfortunately I won't know what kind of speed it will gain because I've done other things since my last gps run.

I noticed that my riva grate was flush with the ride plate where the stock grate on my gtx sc is not flush. Maybe about 1 mm difference.