back pressure for 850 motor

[eatchow]

im building a exhaust system for my 1960 600. my motor is a built 850(930cc). im useing a abarth header and building the rest. what length should i build the rest of the exhaust? i have read that these motors like back pressure. any ideas?

[Pantdino]

I believe Paul has specific information on his website, scuderiatopolino.com

No engine likes backpressure-- but a good exhaust system is designed so that each exhaust pulse helps to pull out the next one so the engine has more power than with no exhaust at all..