what good exhaust design for m20?

[markus_74]

I just buy locally an eisennman replica here, but it only free flow without any baffles and chamber inside and the design is nearly same with magnaflow.

Does is it good? Or some good exhaust has complicated design inside?

This is the picture and not expensive.

[reggid]

define good.

[markus_74]

Tried exhaust yesterday without center box, it is very very loud like racing car and I'm not comfortable with this sound as it is make huge bass resonance noise inside the cabin.

I will try to install center box today and if still too loud I will replace with another exhaust.