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In my last engine (1995 cc T4 with 44/38 valves, 'H' grind cam) I had shortened VW411/412 heater boxes, connected to the porsche shroud and ducted into the original bug pipes and all, with a BAS 4 in 1 header (this is a 40 mm diameter) and dual BAS silencers.
This worked pretty well. Didn't feel like it restricted the top revs at all (5950 revs in 4th with 3,875 differential and 0,93 4th gear: i.e. a stock 1303S 'AT' trans and 225/50/16 tires).
For my new engine, I will use no heater boxes, but just a header (BAS 42 mm diameter stainless) and same (now also SS) silencers, but with a 'Eberspracher BN4 standheizung' = small aftermarket gasheater with timer (also sold for use in other cars). I still have to install this, but it have to find a smart place for it. Maybe adjacent to the battery location).
Hope you get the ideas rolling for yourself as well.
Good luck,
Walter
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