my frd said the sound level of TP and HFC are same?? is it real???
And I saw some HFC are built in reasonator and the flex pipe.i knew the reasonator is preventing the pollutant but how abt the flex part? is it used for reducing pollutant??

I m thinking to hav Nismo header + megan HFC + greddy TiC, anyone do this combo before, share ur experience .. thz thz

 

ok shoot ur friend for being a DA. TP and HFCs are def diff sounds on exhaust. And the high flow cat pollutant w.e ur saying just imagine a OEM cat with bigger holes and a lil more flow there ya go. TP imagine a straight pipe with well nothing just that. And for ur combo exhaust ur asking i say search

 

Your friend probably doesn't even know how a catalytic converter functions. If my friend said that I would have recorded a video of me having sex with his girlfriend.

 

Always begin a dumb question with “My friend…” You are learning well.

 

 

 

They are similar but not the same. Test pipes are louder and raspier.

I don't know of any HFC's with flex lines connected to them, but neither a resonator or flex line affect emissions. A resonator affects sound only. A flex line only allows a small degree of flexure to prevent cracking of the welds.