Sounds much pipier, more throaty. Havent had it on the water yet, The MSD Mags spark for 26 drgrees, should clean up the lower end. Replaced an antique Mallory Sprint mag. Met a guy off Craigslist w/ a 454 for sale ended up getting the Mag off him for $150. I check Jegs before i left and just the mag was $1345 and the box was $450 + wires.