True that. also, those 4 bannger with loudass 3" piping CAT back HAVE NO torque or HP gain at all.

My Setup is Perfect for my Car and My Mods (H22A + Bolts on and stuffs). High flow Cat converver let all the air through, then there's a LIL filter in the MID section will "pressurized all the High flow AIR". Then the 2.5" Rear end will be perfect for ALL that pressure to be released and yet give it maximun Torque and HP gain. My cousin and His friend work with performance car for over 30 years and they know their stuff.

My setup is 100% safe and ready for Turbo or N2O (even though I don't know much about these) but my cousin said that my Catback system has the same design as Misfiring system where they fire off massive Pressure and give the car massive increase Torque when u SLAMMED on the GAS pedal. here're the side to it, for Turbo, this System can help Eliminates the FLAWS and DISADVANTAGE during TURBO LAGS. when it's TURBO LAGs, your car loose TORQUE and ACCELERATION. By having this set up, it'll Give your Car BACKUP Pressure + acceleration when ur TURBO reach it max.

here're a Simple Explaination:

Front End = GIVE MASSIVE AIR FLOW.
MID FIlter = BLOCK AIR and PRESSURIZE
REAR END = 2.25" - 2.5" Piping for 180-280 HP cars will FIRE Massive Pressure generated in the Front End