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Any upgrade to the C5 ignition coils is unnessicary unless you're running high compression, FI or nitrous setups where a stronger spark is nessicary to ignite a significantly dense fuel/air mixture.
I installed them on my 98 A4---Mostly because i got them cheap and for the "bling" factor----No noticable power gains at all-----
But they look so Cool !!!!!!!
I put them on and noticed my engine ran much smoother at idle. No Horsepower gain but I leave my engine covers off now because they do look good. My plan is to use N2O and thought the MSD coils would be a good safety net
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.