Car shakes under heavy acceleration
Hello everyone, I've been experiencing a problem now for a while. My 03 type-s will shake and vibrate alot under when I gun the throttle. This will happen in all the lower gears say 1-4. At first I thought it was my old tires that were almost bald, well I got new tires and still the same shaking. The tire shop did a free-alignment check when I got the new tires installed and they did say that it was out of alignment alittle bit. But I do not notice this while driving, the car holds pretty straight. What do you think could cause this.
When I say shake and vibrate i mean you can hear my CD cases rattling back in forth in the door pocket, so its a pretty strong shake. I don't have many mods just a CAI and HKS Catback exhaust.