theres this weird rubbing noise coming from my front passengerside tire. Last night I took the front tire off checked the rim, rotor, brake caliper, brake pad for anything that might be caught somewhere but couldn't find anything. today I noticed the noise only happens when I'm exactly at 3500RPM both when I increase speed and decrease speed but as soon as I go past 3500RPM it stops. I think it either is something in the tranny or has something to do with my downpipe. anyone have any suggestions?