I have a 05 G35 Coupe AT modified with the JWT Pop/Z-Tube and 5/16 Copper Iso Thermal Spacer.....Would this help the increase in HP and TQ? Don't care too much for the sound but it is a plus!

 

have you searched? this has been beaten to death...

yes high flow cats will help with power with the mods you listed... a full exhaust would be better...

i woudnt go with Berk... try Fast Intentions or Crawfords

btw your thread will most likely be moved

 

yah youll get an awesome 2 hp out of it.


... dont forget stickers = 5hp each