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The mugen wings are better,

What's your idle rmp?
If it's idling too low then it can do what you have described. A broken engine mount i think would be causing you a few more problems.

I have a 94 vtir mate and had a similar problem. When i upgraded the exhaust it dissapeared.
However a 'rattling sound' is pretty vauge so could be numerous things.

Mate make sure you do the homework before you get it all done.
Dropped mine an inch or so and kicked the wheels up to 17's (with low profiles) a few weeks ago.
Unfortunately the offset on the...