So on top of me repairing and tuning up the Leon 4x4 to stage 2 I am also building a 500hp engine setup on the side... oh my wallet Hey guys just wanted to get my parts list checked off as im starting to buy things for this build and get a few questions answered. The car is a Seat leon 4x4 ( exactly the same as a golf mk4 4motion or an audi a3 8L 1.8t quattro, or if it exists a TT 180 quattro ) my poor friends in the USA never got the leon or the early a3. The goal is to have a fast little street car and going to some track days over here in Germany. So here goes, any opinions and ideas would be appreciated. AGU largeport longblock 60,000 miles (150hp a3) Wideband sensor (if i dont have one already, havent looked) Ignitron ECU, or Maestro Tuning Suite (Ignitron is plug and play direct replacement of the ME7.5) (7500 rev limit) (unless valve springs then 8000) VVT Chain and tensioner/4 window sensor *****(Can i wire this in directly to the ecu pinout? or do i have to get the entire engine loom and ecu from a car with VVT?)***** forged H-beam rods and ARP rod bolts (unfortunately not rifle drilled) (is it worth going rifled?) Stock AGU pistons Supertech stainless exhaust valves valve seats all 20 Valve springs? (not entirely necessary?) ARP head bolts T3 top mount spaghetti manifold Holset HX30 6cm, HX32 8cm (rare turbo), HY35 10cm, or HX35 10cm twin scroll (rare turbo) 3" downpipe with 3" 200cell cat at midsection (far from turbo) to 2.75" piping the rest of the way back Phenolic Spacer FMIC custom setup GATES OR OEM TIMING BELT??? HELP??? Metal finned water pump E85 (255lph pump, 1000cc injectors, BKR8IEX NGK spark plugs, extra fuel fulters) Upgraded Single mass flywheel and clutch Custom TIP and Filter 80-90mm (RS4 maf?) Oil feed lines for turbo Oil Catch can Upgraded Diverter Valve Let me know what you guys think, anything i NEED to add or im missing just hollar, if you think im dumb also hollar its no problem.