Meets are usually posted in the Regional sections,
http://www.titantalk.com/forums/texas-forum/
K&N should be fine, some others to keep in mind are Volant, AEM, Injen, NISMO. Contact member LANDMAN, he's in Dallas I believe and has access to Cipher which can advance timing. As for exhaust, any 04-06 cat. back system will still work for the 07. Stillen just released some exhaust for the 07 Titan also.
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Titan/Armada Part Numbers

AEM intake, Banks exhaust, Up Rev tuned. Detroit Truetrac
305.5 WHP, 370.4 ft/lbs tq