RE: Oil blowback?
There's not a lot of oil, best I can tell. I'll try the double wrench later. I just checked my book, and it says use a 15mm box wrench. Guess I'll have to find one lol. One thing I did notice, my air filter still looks new, and I changed it a couple oil changes back. The one I took off had probably been on there 60,000 miles, and it still looked really clean.
What does the resonator do?