Do I Have To Readjust My Engine

[Bainator]

My enginge is newly adjustet (mapped).

It was mapped with a 3" exhaust.

The sound is realy weak so im planning to remove some silencers and replace it with freeflowpiping (just an 3" pipe - dont know the english word for it)

Do i have to mapp the engine once again after this ?

[Angus Smart]

wouldnt think so.

you should be ok by just replacing the exhaust with straight through pipe.

[R31Nismoid]

depends how restrictive the current exhaust is.

If its fine, then no problem.

but if it isnt the best flowing etc, then possibly considering the setup your running

[Alex_r33s2gts25t]

After u change the exhaust, drive to a nice quiet straight peice of road (like a freeway) and just disconnect the ground of your battery and turn the headlights on and pump the brake pedal a couple times to kill any residual charge, then your ecu will reset. Then reconnect the ground wire and when you start driving your ecu will start optimising your engine timing... get your speed nd revs up a couple times along the road (say 0-150kmh, stop, 0-150 again) and you should be good to go.