Well i am not sure what with produce more hp? because i could prot and polish a stock maifold but what is the hp rating on that? and what is the hp rating on the intake of the edelbrock performer mainfold kits? And i am talking uper and lower! and any other options of Nice "HP" and or "TQ" because i just bought a 91 gt and it only has bbk headers, short shifter, lowering springs, and will have new custom exhaust soon. just trow some sugjestions at me of combos or anything thanks