Wade, you could put the ultraflo mufflers in place of the bullits and your car would be quieter at idle and low rpms, that is of course until you put your foot to the floor. IMO, the 2 1/2 would be fine for street driving, but at the track I would remove the cat back after a few passes and see what kind of difference it makes... Probably pick up some e.t./mph, only one way to find out.
As far as a muffler shop bending up some 3" tailpipes for you, unless they have a mandrel bender I don't think they could do it. It's a pretty tight radius around the axle and our benders will not get the job done without kinking the pipe real bad, it's a pain in the buttocks and by the time they get done you will have been better off to just buy a set of prefab'd tail pipes and have them install them for you. IMO keep in mind... they could also run 2 1/2 out of your ultraflos up over the axle and then weld on some 3'' extensions, another option.
Has the law been bothering you or something? Or do you simply want your ride to be quieter?
I would put the ultraflo kit on your '93 and keep a race system on your '79. Swap out those bullits (glasspacks) for a real muffler. The ultraflo muffler could be installed with 3" flo-tubes and turn-downs and would sound wicked! If you want to go cheaper on a muff, get the welded aluminized ultraflo (Race Magnum). And there is always the 2 and 3 chamber flowmaster.
Rule of thumb -- smaller pipes make more noise (high pitch) than bigger pipes do (low pitch, deep tone). That is what I have realized working in a muffler shop.
Just tryin to help... let me know what you think.
Later
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RLS Racing!
93 LX
9.20 @ 147mph
03 Mach 1
12.39 @ 116mph
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