ok quick update on mine if ppl were curious...
front pipes (big fat mofos) are in
aftermarket cat is in... its a justjap item (it hasnt been bashed out)
3.5" exhaust in
the car still has its original tune so there is not much difference in lag.... i think there seems to be less lag in on/off throttle response
gonna wait till i get all the other stuff (cam gears, injectors, afms etc) before retuning
new exhaust will def provide more power tho... straight after the exhaust was done the car started backfiring and misfiring at high rpms
time will tell