ZZP downpipe

[RobGTP]

If i get the 2.5 inch zzp downpipe with the magnaflow high perf cat what would this affect. How would it affect the gas mileage and how the car sounds? any thoughts of how much hp this would really add. The car is just stock. Thanks

 

[Explicit_Spade]

Not enough to make it worth it. Get headers instead.

 

[01gpgt01]

get atleast a 3 inch, The 2.5's for N/a cars

 

[Juanmiguel]

Sound wont change unless you change the mufflers. Mileage wont be hurt either. 2.5" is no good for supercharged, get the 3" at least. But headers would be best.

 

[JoRoW99]

My sound changed a little, it got a little louder, but it was good. no change in gas mileage. It will set a cat inefficiency code unless you get it tuned out.

 

[footballplaya3k]

My sound changed a little, it got a little louder, but it was good. no change in gas mileage. It will set a cat inefficiency code unless you get it tuned out.

This except I don't see why he would throw a cat code....

 

[blueguy]

This except I don't see why he would throw a cat code....

Before even with the HFC's the PCM thinks there isn't a converter because they flow so well

 

[gtpsleeper]

when i had the 3 i noticed a small increase in MPG...