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I just watched the latest Engineering Explained video in which he talks about our favorite engine sounds.

The concept he outlines where the ignition timing is offset during off-throttle scenario in order to keep the turbo spooling isn't really a new thing (or is it?). When I installed my EST exhaust (DP+cat back+stock tune) I started hearing lots of crackling and popping. My question being, is the Volvo stock tune coded to do the same thing? and is the stock exhaust designed not to allow audible crackle and pop?

Does anyone else hear popping and crackle on a stock tune with an aftermarket exhaust?


 

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Does anyone else hear popping and crackle on a stock tune with an aftermarket exhaust?
After I installed the Snabb down pipe (still have factory tune and factory cat-back exhaust) mine crackles and pops under heavy throttle and high RPM shifting.
 

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Oh, I didn't even notice that question.

Long before my tuning adventures, I had a Phuz DP and EST catback. Lots of pops and crackles.
 
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