c90t stock exhaust

[estellerox]

has anyone tried bypassing the "black box" or muffler under the chassis infront of the back tire to get a better sound from the stock pipes? if you can does it require a new chip for the EFI?

 

[Soccer star]

The other thread you started was plenty to ask the same question as here, have a little patience, it is Sunday and alot of the members here check in during their work hours. Creating the same thread or post multiple times makes it difficult to get the answers you need. Stick with one thread and someone should be able to help you out shortly.