What do you guys think of these? They're about $290 and bolt directly on and to the factory cat.

http://www.lcengineering.com/HeadersExhaust.htm

Also, anyone here know how to port the throttle body on this thing? I plan to clean it inside at 100K, but might as well give it a little extra air while I'm at it.
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And the long standing question:

(cliffnote version)
Car ran perfect. Installed K&N filter. 3 days later, TPS dies (closed position failure). Replace. 3 days later, dies (same). Been dead for 8 months. Too angry to replace $92 part that lasted 3 days.

Someone told me my MAF may've been oiled by the new K&N. Thoughts? Easy to clean the MAF? Way of fixing TPS w/o replacing? Thanks.