hey whats up i have a big problem.. I have a 1998 mustang gt and did a ton of mods.. went thru a few motors now have 5.1 CHP stroker bored 20 over diamond pistons forged everything.. swaped over to built cobra tremec automatic was too weak.. trickflow track heat 2v intake.. aeromotive a100 fuel pump trick flow fuel rails #8 feed # 6 return lines flow matched 63 lb injecters.. sumped tank.. 85mm mas air 75mm TB.. high volume motor sports oil pump. canton oil pan.. 373 gears aluminum drive shaft sub frames trq box reinforcements.. stage 3 blower comp cams.. beeehive valve springs.. new but stock P I HEADS.. AND THE CAR IS TURBOCHARGED GARRETT 67MM TURBO... AND FOR IGNITION 9MM FORD RACING WIRES PLUGS ARE GAP 100% RIGHT MSD COIL PACKS AND (MSD DIS 4 BOX) OK NOW MY PROBLEM IS ON THE DYNO THIS CAR FALLS FLAT OFF THE FACE OF THE EARTH AT 5200 RPM ESP ON HIGHER BOOST SO WHEN WE BYPASSED THE MSD BOX IT RUNS FINE. BUT WITH OUT THE MSD BOX IT CANT MAKE HIGH BOOST DYNO PULLS IT WILL BREAK UP.. AND EVEN WITH THE MSD BOX IF WE GOT IT TO DO A FEW DYNO PULLS IT STILL BREAKS UP AT LIKE LOW 5K RPM. these guys at this shop are pros and couldnt understand why it was doing this because i have all good stuff int he car before i left they said something about TACH ADAPTERS FOR THE MSD DIS 4 BOX do you think the car is breaking at 5k rpm because of these stupid little tach adapter boxes??? PLEASE HELP!!!!!!!!!!!!!