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When I made my sidepipes and headers for my 289 I initially planned on using the spiral type Lobacks with a 1 inch tube in the center of the spiral baffles, all inside a 3" tube. I found the sound to be real raspy, but even more, the tube became blued from heat buildup for about 4 inches in the area of the 1st baffle. This led me to believe there was quite a bit of backpressure and restriction caused by this design and I opted to change to another type.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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