AND OTHER SOURCES, but the QUALITY, METHOD OF CONSTRUCTION, AND PRICES VARY, from excellent to just decent,but keep in mind both experience in design and quality of the welding and fabrication takes a great deal of time and effort. price TENDS to relate to quality but there are some amazingly effective intakes at decent prices http://www.precision-metalcraft.com/ http://www.summitracing.com/parts/DRT-4 ... /?rtype=10