hi, anyone any experience with either of the following, either mongoose systems (I know they are popular with the ford rs guys ) or the tornado systems?


secondly, I may have touched on this already, classic impreza, unmodified, has it got to be a 2.5 system as most that are advertised seem to be 3".

if I were to purchase a 3" cat back would it bolt straight up? and would there be any drawbacks running a 3" system on a standard car as opposed to a 2.5 inch system.

sorry if this sounds a daft question, but just want to be well informed and make the right purchase.

just to clarify, im not seeking outright performance, I just want a nice sounding system that's not going to have an adverse effect on my car, im fully aware of some sellers claiming an instant 30+ bhp by just adding a back box?? which seems outlandish and far fetched.

 

3" cat back would not borlt on to a 2.5" flange. And if you do change the air flow significantly a remap is always a good idea...
Best bet it just get a 2.5" system, unless you're gonna be going for big power and what not it's all you need. Plenty of Prodrive or STi pipes about.

 

are the prodrive and sti ones 2.5" and assumably bolt straight up?