Full Exhaust System Question

[frainy]

hello i curently have a hks high power back box fitted to my corolla t sport facelift , i was thinking about getting a full system same pipe diameter but with a performance cat performance mid box and my hks back box was just wondering if i would see any more power out of doing it ? and all so would it be extreamly loud as it is quite loud now thankyou in advance . frainy

[BRIDGES]

If you were to get a custom system then it will be free flowing unlike the original system, the cat won't make much difference to sound but if you get a smaller mid silencer then its going to be louder again, so performance will increase a little but sound will increase by a huge margin!!

[farhanali89]

get a 2.5" mandrel bent system with as little bends as possible and you will see more power top end.