Quote:
Originally Posted by jayzee
This H pipe fitted as standard... was this incorporated into the design of the S8 to help them increase horsepower?
Conan, I'm guessing that having one kind of works against your description of the V8 sound as it blends the banks together - more so with an x pipe too?
Is this why the S8 4.2 sounds so different to the S4/RS4 4.2? They are really gruff by comparison.
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The 'H' pipe smooths out the sound a bit as does the 'x' pipe. A 'X' pipe will also allow better scavenging in a fixed rev range. As a V8 dosn't fir all 8 cylinders in a symmetrical pattern it gives that V8 burble unlike 2 x 4 cylinders would. connecting the exhaust for a short length helps smooth the sound. This articles explains a lot.
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Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light. 
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