I just installed the Corksport SRI earlier today. Took it out for a spin, sounds great! However, I've noticed a rattling noise similar to this guy's at lower rpm's (1500-2000)...

I have a long steep driveway and coast down in in neutral. When it's dark, it's hard to see without the reverse lights. However, I don't go down the driveway fast enough to disengage the clutch so I put it in reverse and keep the clutch down. I drive a six speed manual. I've thought about adding...