I have 50 flows on 2 cars (1 BB,1 SB),they seem to like the x-pipe rather than the h-pipe(w/full tail pipes) as far as resonance go's.If you really want resonance try running 40 flows w/ no resonators on the new LX chargers ,I ended up putting a glass pack reso kit on ,now its fine.That being said every car I own has a set of flows on it(except the/6).It all comes down to personal preference, run what ever sounds good to you ,D.