I tilt my head slightly to the right, right handed, just before I start my take away. I'm left eye dominate, and that gives me a better sense of where I'd like my club head to strike the ball..weird huh..lol
I bought a pretty nice one from e-bay, paid $46.00 + shipping. I believe they retail for about 79.00. Here's the one I got, it's 7' X 10' .
I would check e-bay, but bid with caution, and above all, Stay patient..and sneaky.. BTW, here's a link to some nets on ebay. http://www.ebay.com/sch/Nets-Cages-Mats-/50876/i.html
More than likey a bad exhaust gasket, but could be a crack in the manifold also. Best to have it checked out. Having exhaust fumes inside the car is not good. Good luck on the repair..let us know what it was/is..