4AGE 20v Extractors Primary Pipe Length

[robokill]

agree with jimmy on this one. 4-2-1 design will give the engine more torque

Provide some specs. If you have only a worked head and no cam change of some sort then most is to be gained from the engine management which on a 20v is set to accumulate with the environment. Which sucks......

If you changed the camshafts, worked your intake and head then the exhaust gain is becoming a lot more interesting.

End pipe should be no more then 60mm. Larger and you will lose any pulsating effect the exhaust could benefit from. (good for NA engines)

On my tuned 4age 16v I used the standard exhaust manifold up to the 2-1 part. I cut it there to make the 55mm pipe work.

Seen one good exhaust manifold on a 20v and I believe Didier bought that red and black panda coupe. Ask him if he still has it. (was a standard silvertop with exhaust and management done and it was faster then a blacktop)