Try using some glaspacks that are straight through,and just slide 'em way down the exhaust pipes until the pipes come through the other end,then clamp 'em;add your tailpipes and hangers. VOILA! Straight pipes sound-but it has mufflers! From experience...
James

1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck