Headers
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#8
Fitment and ease of install usually. The higher dollar headers often require less modification to fit, i.e not having to grind the k-member and such. Kooks and ARH tuck up better than tsp I think, not 100% on that though. And with the install the more expensive ones usually install easier as long as the car is high enough. There's no arguing that tsp is a fantastic budget header though.