If I had a YB 2Ltr engine for circuit use with a Borg Warner EFR 7064 Int WG on L8 ECU, and wanted to reduce the torque curve on the dyno graph so that it didn't have a 300ftlb increase between 3200-4200rpm, what options do I have?
I'm quite happy to have a reduction in torque from the 490 ftlb (it would help traction and gearbox) but keep the 460 BHP top end if its possible.
I'm almost starting from scratch with the engine build and don't want to be changing coolers and pipes and inlets if I change to the slightly larger BW EFR at a later date so what are the pros and cons of fitting these parts below on the above set up, will they add/reduce torque/BHP and affect throttle response etc;
.A/S /Hart inlet cover over a 4x4
.70mm Throttle body over a 63mm 2wd
.using 70mm pipes on a 100mm intercooler over 63mm pipes
.or using a 63mm piped 70mm core intercooler


Is there a method of boost control that I could add that would help flatten the torque curve without changing the ECU and adding £1000s to my bill?