There has to be some combination of parts (lengths, diameters, boxes, resonators) to make it sound like an XK-E (or my Lexus 2JZ 3.0 liter)!! A 500 watt amp, lots of speakers and a recording of an XK-E would be the cheapest way. 
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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