like a peice of crap, When I first drove my '51 Chevy with the stock '51 Powerglide, it had no exzaust eccept 1.5 foot coming off the manifold, it was wayyyyy to loud, car's got to have mufflers to pass inspections, ya don't need cats on cars made b4 1975 but, ya do need mufflers, not to mention, the car needs backpreassure to run correctly unless, your running at WOT all the time. The 3" pipes are too big for the small 6, you wan't 2 1/4" at most. I put 1 Thrush Glasspack muffler where the stock muffler would have been ( just behind the x member, approx drivers side front floorboard area ) it is a 31" 2" Magnum glasspack, even though it's a temporary exzaust system, it sounds awsome, at crusing speeds 45-50 MPH it almost sounds like the nice low rumble a Small block V8 makes at the same rpm, get on it and it gets better just, Idle is a little raspy along with just off idle.