My next one is gonna be the tired & true dynomaxes with glasspacks rearward alongside the leaf springs. "cherry bomb" parts house glasspacks are cheap & do not neck down where the end nipples are welded to the main case & the louvers are punched outward (both good for flow) but they do get louder over time like most of em probably do. To me the best would be a restrictive (quiet) system all the way back with electric or vacuum cutouts right at the connector. (keeps neighbors/cops happy) & the noise (& power) is there only when needed/appropriate). Control is always a good thing.