hey all -- I went out and bought this system: http://www.summitracing.com/parts/sum-cbjj111/overview/year/1987/make/dodge/model/w150 For my 1987 W150 with a 318, but my mechanic told me that it is impossible to fit headers to the truck because the engine has "air injection cylinders" which I guess is an emissions feature that Dodge added in 1987. Am I SOL? Anyone else encounter this issue? Am I stuck with exhaust manifolds or are there options? Thanks!