Well i have a Na 300zx with the HKS Exhust (turbo or sport dont know)system, it has hks H pipe with the resanators and the mufflers, But i also have the Greddy X pipe the straight one with no resanators, Will the difference in sound and qulity will change a lot or no? what would you suggest keeping on the car? The sound of the HKS is not so loud but nice deep sound, but what do you think?