The Austin Healey 3000 I drove back in college had a split manifold, and when the muffler and tailpipes were removed for SCCA club racing, the exhaust pipes and manifold were the right tuned length for good breathing with the engine wound up close to its horsepower peak- - - - -I'll bet some Limey engineer figured that out when they decided where to locate the muffler!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!