Here is my recent experience with Ultraflows: 600hp motor with 3" X pipe, long case 3" ultraflows and 2.5" tail pipes... good sound yet surprisingly quiet until you went full throttle.
With same motor, I now have 3" all the way through with H pipe and 14" ultraflows. Not obnoxious by any means, but definitely louder than the first combo above.
I prefer #1, as I am sure my neighbors did as well. but large case ultraflows would not fit in the first gen, and nobody offered a kit with 3" mid and 2.5" tail pipe.
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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