I've got a '75 Garelli Eureka Flex with a polini 70, and 11/42 gear ratio, everything else stock..including exhaust...and yes i know i should've gotten exhaust first but i didn't.... I've read a lot about Techno Boss and was going to get one off Treats, but then i saw this garelli VIP simonini on Treats and was woundering which was better? I can hack and weld so any exhaust will work. Thanks