Quote:
Originally Posted by redhot
Perhaps someone would chime in with some exhaust theory: does it really matter that much on an close to stock 914 2.0 engine?
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The best ehaust for a street/semi-competition motor is a 4-2-1 with 30"+ primaries and similar secondaries depending on the state of tune. However, the architecture of the flat 4 boxer engine doesn't lend itself to this sort of design so you get the compromise 4-1 layout with a merged collector at best. At least CSP and the like have got the 4-2-1 concept firmly in their blood to attempt it on the VW flat 4 engine but the spaghetti pipework has to be an expensive work of art. A 4-2-1 arrangement should give a more flexible engine that may be down 1 or 2 bhp on the 4-1 unit but that flexibility shows itself in A-B times and economy.
Clive