Will turndowns affect the sound of cut-offs???

I just installed a headman h-pipe(NUMBLES :nice: ) with mac flowpaths and it sounds bad-ass. It sounds like................. well, just bad ass :nice: I've got one complaint, I sounds too flabby when I'm driving at regular speeds. Kind of like an old truck. I fell in love with it when I revved up to about 4900rpm last night at a ricer who got in my way :D Is the flabby sound caused by no turn downs, and just like the title says, will they help the sound?

PS, I felt no power increase with the h-pipe, was I supposed to? FYI stock headers, headman h-pipe, mac flowpath.
 
Before the 95gt I now own, in 2001-2003 in had another 95gt with a similar setup. BBK headers, BBK h-pipe, and single chamber borla's. It sounded crazy loud, as I'm sure yours does. At crusing speeds, my turndowns sounded a bit how you described, like my uncle's 1977 F-100. When I actually first cut off my pipes, it sounded like an old truck to the extreme. When I put the turndowns tips on the mufflers , it took away some of the uneven-sounding burble found on really old cars, but still was REALLY loud and deep.
As far as performance, with the H-pipe on a mostly stock motor, you will notice a bit less low end (I mean real low end like 1000-2000 rpm's) but you will have more top end. 3:73's with that exhaust set up will be perfect. Good luck! :flag: