For honda people i have a honda 3.5A4 in my car now needing to replace is there any differance in an 3.5A4 and An 3.5A5? Looking at the specs the A5 has more horsepower and torque and would i be able to use the same adaptor plate to the trans? THANKS 3. J35A4 (2001 – 2004) – this engine replaced J35A1. It featured a new intake manifold, its throttle body diameter was increased to 64 mm, and a new exhaust system was used. Also, there was an improved VTEC system, the diameter of intake valves was increased to 35 mm, of exhaust valves to 30 mm, the compression ratio was raised to 10. The J35A4 stock fuel injectors size was 240 cc. These upgrades boosted the power to 240 HP @ 5,400 rpm, the torque was 328 Nm @ 4,500 rpm.This engine was intended for Honda Odyssey and Honda Pilot.4. J35A5 (2002 – 2006) – this engine replaced the J35A3. Here a cylinder block with cast iron sleeves was used along with the new 2-stage intake manifold (activated at 3,700 rpm), an electronic throttle, an improved exhaust system, and more dynamic camshafts. The VTEC system is triggered upon reaching 4,400 rpm. Here the fuel system has been modified, and everything is controlled by another ECU. This modes increased engine efficiency, and its power reached 265 HP @ 5,800 rpm, the torque was 340 Nm @ 3,500 rpm.This engine was created only for Acura RDX.