been hankering after an a7 bitdi for a while now, having taken my a4 to 400hp its about done unless i want to spend alot more money and lose drivability not only that shes 8 years old so its time to move on. Behold the Bitdi engine. spec sheet --file:///C:/Users/Nate%20Brand/Downloads/pps_604_audi_30l_v6_tdi_biturbo_engine_eng%20(1).pdf the turbo and fuel system is the main change in ancillaries compared to my capa the changes are as such 2260 --- 1749vnt/3067wg cp1 R85 --- cp4 r80 better ic Internals better piston cooling ducts better piston design reducing temps by 25c better wrist pin design port changes split head cooling design to force more water around the hotter areas of the head ie valve seats and injector areas The gearbox is also a zf8 8 speed planetary box which if you look at the design is impressive and efficient these improvements yield 313hp and 650nm ( 1.8k-3k ) which as we can all admit is alot straight out of the box doing lots and lots of research on this engine in the past week the turbo set up is extremely clever having 3 phases of operation requiring 4 bypasses 3 controlled. these are totally on the 1749 then moving to both to 3.3k then totally having the wastegated 3067 to a 5.2k redline the larger turbo always precharges the smaller. this arrangement including the hot side also always means the smaller turbo is spooled to keep throttle response and lag to zero. if you are not aware these engines map to around 400hp straight out the box, but straight away i have some improvements in mind list is as follows Uprate to large FMIC Swop CP4 HPFP to a cp3 for alot higher flow R95-R110 range ditch rear boxes DPF delete EGR delete larger intake Hybrid the larger wastegated turbo to 3580 billet with these mods 500hp and 1000nm plus should be easily achievable still with zero lag. the hardest part i think will be mapping it as the ecu will control the 3 phases of the turbo operation and i think the turbine bypass will need to option sooner to get the larger turbo spooling with out sacrificing the rpm of the smaller turbo. the extra fuel injected will help to spool this huge increase in turbo size but only time will tell..