Cobb tuning offers a great selection of quality performance parts. My only expierence with them was ordering a K&N Air filter, It took a little long to ship and i was a little pissed but nothing worthy of giving them a bad revue, especially since internet stuff is always a little less organized at any shop. Filter took almost 2 weeks from the time i mailed the money order to the time it came. But im DEFINITLY BUYING FROM THEM AGAIN, hopefully my headers will be a little quicker....