Exhaust diameters

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Your car is a: 1970 Fiat spider
Location: S.E. Kansas

Exhaust diameters

Postby 70spider » Thu Oct 26, 2017 6:28 pm

Hey, I thought about getting a header for my rebuild but could not find an Abarth for my 1438 motor. So, I was looking at some headers a couple of our vendors sell and it seems the collector is 21/4" in diameter. Is this to large for a 1438 putting out around 100hp. I could get a reducer to go from 21/4" to 2" at the beginning of the downpipe and run a 2" system, would that work?
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i

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