Right... and in regards to me previous post: So it will improve performance right and will not actually decrease power or torque? as i have read around where sometimes this can happen.

also, the bigger the tip of the exhaust, would it produce more sound?

Because i want an exhaust from their that will sound deep and is mid-loud. But mainly something that sound really deep rather than that bad noise i hear from some exhausts that sound like farts. Do you think they'd be able to do that?